Which example identifies a motion that produces acceleration? Justify your reasoning as to why that example identifies with acceleration the best. A) a hockey player that is moving at a constant speed in a straight line down the boards

B) a race car driver at a constant speed around an oval track

C) a photon that is moving in a vacuum with a constant velocity

D) a car racing down the highway on cruise control at a steady speed

What's the Example and Justification.