The Rest of the Departments Practice Test

The main idea being tested is how to show how a total is divided into its parts. A pie chart does this most clearly because it represents the whole as a circle and uses slices to show each part’s share. Since all slices add up to one circle, you can instantly see the relative proportions and which pieces make up the whole.

Other charts don’t communicate this composition as directly. A bar chart compares quantities across categories but doesn’t emphasize that all parts come from a single total. A line chart tracks changes over time, not a single snapshot of distribution. An area chart can illustrate how parts accumulate over time, but it’s less straightforward for showing the exact composition of one total at a glance, especially with many categories or small slices.

So, for displaying how a whole is composed by its parts, a pie chart is the best choice.