DA0-002 Visualization and Reporting Practice Question
A data analyst is preparing a quarterly business review report for a retail company. The report includes a bar chart showing sales by region. The analyst notices that the chart is very wide and the region labels are overlapping, making it hard to read. The analyst wants to improve readability without losing any regions. Which action is most appropriate?
⚠ Common exam trap
The trap here is assuming that rotating labels or widening the chart is sufficient, when the root cause is insufficient horizontal space for labels on the x-axis.
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
✓
Convert the bar chart to a horizontal bar chart, placing regions on the y-axis.
Converting to a horizontal bar chart is the most effective solution because it provides ample space for region labels on the y-axis, eliminating overlap and improving readability. It maintains the ability to compare sales across regions. The other options either partially mitigate the issue or introduce new problems such as reduced comparability or awkward label orientation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Rotate the region labels 90 degrees so they fit vertically under each bar.
Why it's wrong here
Rotating labels 90 degrees can prevent overlap but makes them harder to read, especially for longer region names. It also requires the viewer to tilt their head, which is not ideal for a business review. This is a quick fix but not the most effective for readability; other options may better utilize space.
- ✗
Increase the width of the chart to provide more space between bars.
Why it's wrong here
Increasing the chart width may reduce overlap if the issue is due to cramped bars, but it may not fully solve the problem if labels are inherently long. It also may not be feasible if the report has fixed dimensions. Moreover, it does not address the fundamental issue of horizontal space for labels; horizontal bars are a more robust solution.
- ✓
Convert the bar chart to a horizontal bar chart, placing regions on the y-axis.
Why this is correct
A horizontal bar chart gives each region label ample horizontal space, eliminating overlap and making labels easy to read. It also accommodates long region names without rotation. This is a standard best practice when category labels are long or numerous. It preserves all regions and improves readability significantly.
- ✗
Use a pie chart instead, as it naturally avoids label overlap by placing labels outside the slices.
Why it's wrong here
A pie chart is not suitable for comparing sales across many regions because it is difficult to compare slice sizes accurately. It also does not inherently avoid label overlap; labels can still collide if there are many slices. Switching to a pie chart would sacrifice comparability and may not solve the readability issue.
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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.