Which of the following statements about a pie chart is false?

A) A pie chart is graphical representation of the proportion or percentage of frequency of each category of a categorical variable.
B) A pie chart is usually used to display the relative sizes of categories of a numerical variable.
C) A pie chart always has the shape of a circle.
D) The size of each slice of a pie chart is the proportion or percentage of frequency of the corresponding category of a categorical variable.

B