Doug places a toy car at the top of the first hill and releases it. The car stops at point X. Which change to the model would allow the toy car to travel over all three hills? A. Add a loop after the tallest hill in order to maximize the kinetic energy of the car.

B. Order the three hills from shortest to tallest so that the potential energy builds up according to the height of each hill.

C. Order the three hills from tallest to shortest to provide the potential energy needed for the car to make it over each hill.