According to Newton's third law of motion, if object A exerts a force on object B, what is the reaction?
A. Object B exerts a force equal in magnitude and opposite in direction on object A.
B. Object B remains unaffected.
C. Object A exerts a force in the same direction on object B.
D. Object B exerts a force twice the magnitude on object A.
Newton's third law states that for every action, there is an equal and opposite reaction.