Answer: d.) The books have a great deal of inertia and do not move easily
Explanation:
Inertia is the property of a body due to its mass. A heavy object requires more force to be pushed or pulled as compared to a lighter object. Basically, due to the property of inertia, a body resists change in its motion.
In the given situation, the books are heavier as compared to the paper. A small force would pull out the paper but books being heavy would not move easily. Thus, a paper placed in between two books can be quickly pulled out without moving the books. correct option is d.