Identify Newton's Law of Reaction

Identify Newton's law of reaction.

A) For every action there is an opposite and equal reaction.
B) A body in motion tends to remain in motion at the same speed in a straight line unless acted on by a force.
C) A change in the acceleration of a body occurs in the same direction as the force that caused it.
D) The more weight ones left regularly the more the muscles react by gaining strength.