What problem can occur with pie charts that have too many slices?

• A. They become faster.
• B. It automatically repairs itself.
• C. It becomes crowded and difficult to read.
• D. They can have too many slices to label clearly, making them hard to interpret.

Answer: (D)

Pie charts work well when you can see a few distinct proportions at a glance. As the number of slices grows, many of them become very thin, and labeling around the circle or relying on a dense legend becomes cluttered. That makes it hard to identify which category a label refers to and to compare the sizes of the slices quickly, so the chart becomes hard to interpret. That’s why the problem is having too many slices to label clearly, which hinders understanding. If you have many categories, a bar chart (or grouping small categories into “Other”) often communicates the data more clearly.