Pie Chart is defined as:

• A. A chart that shows the relationship of a part to a whole
• B. A chart with bars whose lengths are proportional to quantities
• C. A line graph
• D. A scatter plot

Answer: (A)

Pie charts visualize proportions of a whole by dividing a circle into slices, with each slice representing how large a part is relative to the total. This setup makes it quick to see which parts dominate and how they compare to the entire amount, since the whole circle represents 100%. The description “a chart that shows the relationship of a part to a whole” captures that idea precisely.

The other chart types describe different visuals: a chart with bars shows quantities as bar lengths and is used for comparing values, a line graph tracks changes over time or another continuous variable, and a scatter plot shows relationships between two variables.