Which statement best describes the use of pie charts?

The use of pie charts is best described by the assertion that they are ideal for fewer than seven categories. Pie charts visually represent parts of a whole, and this visual format becomes cluttered and less effective when there are too many segments. When the number of categories exceeds seven, each slice tends to become too small to effectively convey significance, making it difficult for the viewer to differentiate between them.

Hence, for pie charts to function well, they should be limited to a smaller number of categories, ideally not more than seven. This restriction allows for clearer, more impactful visual communication of the data presented, ensuring that each category can be easily read and understood at a glance. This approach highlights the relative proportions of the parts to the whole, which is the main strength of a pie chart.