Which graph would you use to compare the composition of categories in a whole?

• A. Circle graph
• B. Histogram
• C. Bar graph
• D. Line graph

Answer: (A)

When you want to show how a whole is divided among different categories, the circle graph is the best choice because it turns the entire total into a circle and uses slices to represent each category’s share. The size of each slice is proportional to that category’s portion of the whole, so you can quickly see which parts dominate and how the whole is built from its pieces.

Other graphs serve different purposes: a histogram displays the distribution of numerical data across intervals, not how a whole is partitioned; a bar graph compares separate categories but doesn’t inherently show that their values add up to a total; a line graph tracks changes over time or another continuous variable, not the composition of a single whole.