DA0-002 Visualization and Reporting Practice Question
Which TWO actions will improve the readability of a bar chart showing quarterly sales across five regions?
⚠ Common exam trap
DA0-002 often tests whether candidates confuse 'more visual elements' with 'more readable' — adding gridlines, 3D effects, or secondary series usually reduces readability, not improves it.
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
✓
Sort bars in descending order of sales
Option B is correct because sorting bars in descending order of sales arranges the categories by magnitude, letting viewers instantly rank the five regions and spot the highest and lowest performers without scanning back and forth. Option C is correct because data labels placed on top of each bar display the exact sales values directly, eliminating the need to estimate values against an axis and reducing reliance on gridlines. Together these two changes make the chart's message immediately clear. Option A does not belong because overlaying a cumulative line adds a second, differently scaled metric that complicates rather than clarifies the quarterly comparison. Option D does not belong because gridlines at every bar add visual clutter and compete with the bars instead of improving readability. Option E does not belong because 3D bar charts distort bar lengths through perspective, making values harder to compare accurately.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Overlay a line chart showing cumulative sales
Why it's wrong here
Overlaying cumulative sales adds a second measure on a different scale, so viewers must decode two y-axes and cannot compare quarterly bars directly. A combo chart suits tracking a running total against periodic values, but the stem asks only for readability of the quarterly regional comparison.
- ✓
Sort bars in descending order of sales
Why this is correct
Sorting bars by descending sales creates a clear visual ranking, letting viewers compare regional performance instantly rather than scanning an arbitrary order. This directly satisfies the readability constraint by reducing cognitive effort when identifying top and bottom performers across the five regions.
- ✓
Add data labels on top of each bar
Why this is correct
Data labels place each quarter's exact sales value directly above its bar, removing the need to estimate against the y-axis scale. This directly satisfies the readability constraint for comparing five regions, since precise values become immediately visible without cross-referencing axes or gridlines.
- ✗
Add vertical gridlines for every bar
Why it's wrong here
Gridlines at every bar boundary add visual clutter that competes with the bars rather than helping estimate values. Dense gridlines suit scatter plots or line charts needing precise coordinate reading, not a categorical bar chart where the axis labels already anchor each region.
- ✗
Switch to a 3D bar chart to add visual depth
Why it's wrong here
3D perspective skews bar heights and depths, making regional values harder to compare accurately against the axis. Depth effects suit decorative dashboards where precise magnitude reading is not required; here the requirement is accurate comparison of quarterly sales across five regions.
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Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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