People living at Earth's equator are traveling at a constant speed of about 1,670 km/h as Earth spins on its axis. What are these people experiencing?

A. deceleration

B. non-directional movement

C. acceleration

D. constant velocity

The people living around the equator experience acceleration. Acceleration is the change in speed or/and direction. When on a rotating body, the speed does not change it is only the direction that changes as it rotates. When on a rotating body you do not have to change speed but only direction. In a normal situation when you are traveling on a circle you will never have a straight line.