The preposition "beneath" means "under," which fits the meaning of the sentence.
The correct sentence should be:
"The book is beneath the table."
Thus, the correct answer is "beneath" (Option D).
Arun’s present age in years is 40% of Barun’s. In another few years, Arun’s age will be half of Barun’s. By what percentage will Barun’s age increase during this period?