Answer: B
average rate simply means, a constant rate something is moving about during a certain period.
now, object quite often or most always do not move at some constant speed, but the average rate gives a ballpark of how it must be moving.
so, since in this case the "slope" or average rate is a positive 6, one can say the rocket is higher at t = 3 than at t = 1.
Step-by-step explanation:
