Question 1
According to Newton's third law, what is the relationship between an action and its reaction?
The right answer is the one marked above.
Equal in magnitude, opposite in direction. For every action there is a reaction, equal in magnitude and opposite in direction.
The action is the force applied by one object on another; the reaction is the force applied by the second object on the first.
The magnitudes are always exactly equal, however different the two masses. When you jump off the ground, the force you apply to the earth and the force it applies to you are the same size.