DA0-002 Visualization and Reporting Practice Question
A data analyst wants to show the proportion of total sales for each product category. There are 4 categories. Which chart type is most appropriate?
⚠ Common exam trap
The trap is confusing 'proportion of a whole' with 'comparison across categories' — candidates may pick a bar chart for precision, but the question specifically asks for proportion, which is the defining use case for a pie chart.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Pie chart
A pie chart is designed to show parts of a whole, making it the most appropriate choice for displaying the proportion of total sales contributed by each of four product categories. With only four categories, the slices remain readable and the proportional relationship is immediately clear. Pie charts work best when the number of categories is small (typically 5 or fewer) and the values sum to a meaningful total.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Pie chart
Why this is correct
A pie chart maps each category to a slice whose angle is proportional to its share of the whole, directly showing part-to-whole proportions across the four categories. Bar charts compare magnitudes but do not convey proportion of total sales as clearly.
- ✗
Line chart
Why it's wrong here
A line chart plots values along a continuous axis to show trend over time, so four unordered categories have no meaningful sequence to connect. It is tempting because line charts correctly display metrics such as monthly sales across a year, where the x-axis is temporal.
- ✗
Scatter plot
Why it's wrong here
A scatter plot encodes two numeric variables as x/y coordinates to reveal correlation between them, so it cannot represent four categories' shares of a single total. It is tempting because scatter plots genuinely suit paired continuous measurements, such as examining the relationship between advertising spend and revenue.
- ✗
Histogram
Why it's wrong here
A histogram bins continuous numeric data into intervals to show frequency distribution, so it cannot display four discrete categories' proportions. It is tempting because it also uses bars, and would be correct for showing how measurements such as order values are distributed across ranges.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This DA0-002 practice question is part of Courseiva's free CompTIA 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 DA0-002 exam.