Third person plural pronoun is THEY.
If you want to create a possessive pronoun out of that one, that would be THEIRS.
Possessive pronouns, as the name itself says, determine some kind of possession. For example:
Is this books yours? - No, it's theirs.
Answer:
I think it is D. pair of hands
Explanation:
I know the answer is not A. A pair of lips
The answer will be Hydrosphere
You have to give us more the question doesn’t make since
