types. Bar graph with 5 countries on the x-axis and their populations on the y-axis. China and India have much larger populations than Brazil, Indonesia, or the United States. Which of the following describes the purpose of a bar graph? a.) It uses the relative size of images to demonstrate different values. b.) It is used when you want to show differences in certain, quantifiable characteristics between a few groups. c.) It is used to show the relationship and correlation between two data series. d.) It uses sections of a whole circle to represent separate categories