Quick Answer
The correct answer is the stacked area chart. This visual type is most appropriate because it displays cumulative proportions over time, with each product category’s contribution stacked on top of the previous one, allowing you to see both the total sales trend and how each category’s share evolves across the timeline. On the Microsoft Power BI Data Analyst PL-300 exam, this tests your ability to select the right visual for showing composition over time, a common scenario in reporting category contribution over time. A frequent trap is confusing the stacked area chart with a scatter plot, which shows correlation, or a waterfall chart, which highlights incremental changes, or a pie chart, which only captures a single point in time. To remember, think “stacked areas stack up over time to show parts of a whole moving forward.”
This PL-300 practice question tests your understanding of visualize and analyze the data. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You need to create a visual that shows the contribution of each product category to total sales over time. Which visual type is most appropriate?
Waterfall chart
Why wrong: Waterfall charts show cumulative effect of sequential events, not composition over time.
Stacked area chart
Stacked area charts are ideal for showing how categories contribute to a total over time.
Pie chart
Why wrong: Pie charts show proportions at a single point, not trends over time.
Scatter plot
Why wrong: Scatter plots show relationships between two variables, not composition over time.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Stacked area chart
Option A is correct because a stacked area chart shows cumulative proportions over time. Option B is wrong because a scatter plot shows correlation, not composition. Option C is wrong because a waterfall chart shows incremental changes, not proportions. Option D is wrong because a pie chart shows parts of a whole at a single point in time, not over time.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Waterfall chart
Why it's wrong here
Waterfall charts show cumulative effect of sequential events, not composition over time.
Stacked area chart
Why this is correct
Stacked area charts are ideal for showing how categories contribute to a total over time.
Related concept
OSPF neighbours must agree on key parameters.
Pie chart
Why it's wrong here
Pie charts show proportions at a single point, not trends over time.
Scatter plot
Why it's wrong here
Scatter plots show relationships between two variables, not composition over time.
Common exam traps
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Trap categories for this question
Command / output trap
Waterfall charts show cumulative effect of sequential events, not composition over time.
Detailed technical explanation
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related PL-300 OSPF questions on adjacency and route selection.
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FAQ
Visualize and analyze the data — This question tests Visualize and analyze the data — OSPF neighbours must agree on key parameters..
The correct answer is: Stacked area chart — Option A is correct because a stacked area chart shows cumulative proportions over time. Option B is wrong because a scatter plot shows correlation, not composition. Option C is wrong because a waterfall chart shows incremental changes, not proportions. Option D is wrong because a pie chart shows parts of a whole at a single point in time, not over time.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related PL-300 OSPF questions on adjacency and route selection.
OSPF neighbours must agree on key parameters.
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. You need to create a visualization that shows the contribution of each product category to total sales over time. Which chart type is most appropriate?
mediumWhy A: Option B is correct because a stacked area chart shows the contribution of each category to the total over time. Option A is wrong because a clustered bar chart compares individual values, not contributions. Option C is wrong because a pie chart shows proportions at a single point in time. Option D is wrong because a scatter plot shows correlation, not contribution.
Last reviewed: Jun 21, 2026
This PL-300 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PL-300 exam.
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