The magnitude of the force that the Earth exerts on the book is the same as the magnitude of the force that the book exerts on the Earth. Thus, the correct option is D.
The Newton's third law of motion states that for each and every action i.e., force in nature there is an equal and opposite reaction. If an object exerts force on another object, the another object will also exert an equal and opposite force on the first object. In other words, forces result from interactions of object.
In this case, as the book falls on the ground, the force will is exerted on the ground by the book is same in magnitude to the force exerted by the book on the ground.
Therefore, the correct option is D.
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