Explanation:
The table just reflects where the ball is in the air, h(t), over the course of time, t. From that we see it goes from the ground to it's max height in 1.5 seconds and then falls back to the ground in another 1.5 seconds. So in total, the ball traveled for 3 seconds. The question asks what the average rate of change during its fall from max height is. Or rather, which of the statements provided is the answer.
(Hint: The rate will be negative because the ball is falling down.)