Newton's 3rd law: The force that A exerts on B is equal and opposite (in direction) to the force that B exerts on A.
Substitute the words "the earth" for A and "the book" for B.
A book rests on a table. The earth pulls down on the book through the weight force then the force is the reaction force to the weight force would be the force of the table on the book. Therefore the correct answer is option 2.
Newton's third law of motion explains that forces exist in pairs. It states that for every action force there exist equal and opposite reaction forces, these pairs of forces are equal in magnitude but opposite in direction.
Reactive force is a kind of force that acts in the opposite direction from the force that is applied. For instance, when active force is applied to a stationary wall, the wall will exert reactive force in the opposite direction.
Active and reactive forces always act in pairs and are equal in their magnitude but opposite in direction.
As per the given problem, on a table, there is a book. The weight of the earth pulls down on the book, and then the force of the table on the book acts as a reaction to the weight force. Therefore the correct answer is option 2.
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