The graph shows distance versus time for an object. Which of the following correctly describes the object's motion? a The object is moving with increasing velocity. b The object is moving with constant acceleration. c The object is moving with increasing acceleration. d The object is moving with constant velocity.

The answer is d) The object is moving with constant velocity. This is because the distance versus time graph shows a straight line, which indicates that the object is covering equal distances in equal intervals of time.