Which of the following statements about motion are true? Select all that apply.

A. If an object is changing direction, a force must be acting on it.

B. If an object is changing speed, a force may or may not be acting on it.

C. An object can move to the right only if a force is pushing or pulling it to the right.

D. An object that is moving through outer space far from any other objects will keep moving in a straight line indefinitely.