Which of these best describes what a pie chart shows?

A. How two quantities compare to each other

B. The influence of one variable on another

C. The way that a single variable grows over time

D. A pie chart is a circle and shows parts of a whole

D, because a pie chart show the subsets of a whole unit.

It is not a because that would be a Venn diagram.

It is not b because a pie chart does not include how a variable affects another variable.

And it is not c because it does not show how a variable change but it shows how much of a variable there is.