The gas mileage of Car A is 21 miles per gallon. The gas mileage of Car B is 30 miles per gallon. Which of the following graphs would represent this data most accurately?

A. A pictograph shows two squares. One square has a side length of 11, and the other has a side length of 15.


B. The y-axis of a bar graph starts at zero gallons. One bar is 22 units, and the other bar is 30 units.


C. A pictograph shows two cubes. One cube has a side length of 7, and the other has a side length of 10.


D. The y-axis of a bar graph starts at 20 gallons. One bar is 22 units, and the other bar is 30 units.