A circus has a performer that drives a motorcycle inside a circular cage. The motorcycle drives along the curved inside surface of the cage at a constant speed of 35 m/s.

Which of the following best describes the velocity of the motorcycle?

A. The velocity is not changing because the speed is not changing.
B. The velocity is increasing because the speed is increasing.
C. The velocity is decreasing because the speed is decreasing.
D.The velocity is changing because the direction is changing.