If two points are in a common reference frame, thena. they are not in motion relative to each other. b. they are not accelerating relative to each other. c. they are in the same gravitational field. d. they must be the same point.

option A  

Explanation:

A frame of reference is a perspective that is used to determine if an object is moving.

For example, When you move from one side of a ship to the other our reference of the frame is the ship; if the ship travels is not applicable to that reference frame.

so, when two-point is in the same frame of reference there is no relative motion to each other.

Hence, the correct answer is option A  

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