Which statement best describes Newton's Third Law of Motion (action-reaction pairs)?

• A. For every force acting on an object, there is an equal and opposite force that acts on the same object and cancels it.
• B. An object at rest will remain at rest unless acted on by a net external force.
• C. If object A exerts a force on object B, then object B exerts an equal-magnitude force in the opposite direction on object A.
• D. The net force on an object equals its mass times its acceleration: $F=ma$.

Answer: (C)