Which pronoun correctly completes the sentence?

Please return the books to __________ proper shelves.



A.
their


B.
they're


C.
they


D.
theirs

The pronoun that correctly completes the sentence is C. "they".

The pronoun that correctly completes the sentence is option C, "they."

To determine the correct pronoun, we need to consider the possessive pronoun that can refer to multiple people. In this case, we are referring to the people who will be returning the books. Since we are not given any specific information about the gender or number of the people, we should use the gender-neutral plural pronoun "they."

Option A, "their," is a possessive pronoun, but it refers to plural nouns. It would be incorrect to use it in this sentence because it would refer to the books' proper shelves, instead of the people returning the books.

Option B, "they're," is a contraction of "they" and "are." It is not a possessive pronoun, so it would not be appropriate to use in this sentence.

Option D, "theirs," is a possessive pronoun that refers to something belonging to multiple people. However, it is used after a noun, not before.

Therefore, the correct pronoun to complete the sentence is option C, "they."

You'll find your answer here.

http://www.evilenglish.net/there-their-theyre/