What does a pie chart represent?

A pie chart is a visual representation that illustrates how a whole is divided into various parts or sections. Each slice of the pie represents a specific category's proportion of the total. This format is particularly effective for showing relative sizes and percentages, making it easy to see how each segment contributes to the overall whole.

The key aspect of a pie chart is that it visually emphasizes the relationship between the parts and the whole, allowing viewers to quickly grasp the distribution of data across different categories. It is not typically used for comparing two variables directly, tracking changes over time, or for indicating frequencies of occurrences in the same way that other chart types, such as bar graphs or line graphs, might do.

In summary, the reason option C is correct is that a pie chart is fundamentally designed to represent a whole divided into sections, highlighting how different components relate to the entire dataset.