When is a pie chart used?

to compare parts of a whole

to show a quantity continuously changing

to compare separate quantities

to show estimates

to compare parts of a whole

Step-by-step explanation:

Pie charts is the graph that has circular shape and this circle is divided into different parts called as slice and each slice shows the quantity of proportion of particular observation (categorical data).

Thus, only the first option is correct.

B. Line graph shows the quantity continuously changing.

C. Bar graph or histogram is use to compare separate quantities.

D. Line graph is used to show estimates.

To compare parts of a whole