There is no value on the y axis at points 0 and 12, so since that axis is meant to represent the car's speed, there is no movement at those two points. So D is the correct answer.
In this problem, the zeros of the graph are when the car is not in motion. The curve of the graph itself is the speed/when the car is in motion. You cannot have a negative mph or kph or negative movement, so your answer choice is D.
