Which best describes the purpose of bar graph

They show changes over a period of time

They compare quantities for particular categories

They show the relationship amond parts of a whole

They compare and continuous data

They compare quantities for particular categories

Explanation:

A bar graph summarizes a set of data by categories, shows the data using several bars with the same width, each of which represents a specific category. The height of each bar is proportional to the value of each category. The categories can be, age groups, amount of sales, among others.

I would go with D.