Final answer:
In order for matter to behave exactly as it would in a stationary frame of reference, it needs to be in a frame of reference that is not accelerating or moving at a constant velocity.
Step-by-step explanation:
In order for matter to behave exactly as it would in a stationary frame of reference, it needs to be in a frame of reference that is not accelerating or moving at a constant velocity.
Out of the given options, the frame of reference in which matter would behave exactly as it would in a stationary frame of reference is C) moving at a constant velocity. In this case, there is no acceleration or change in speed, so the behavior of matter would be the same as in a stationary frame of reference.