The third one, roundabout answer.
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:
There are many reasons we need to protect wilderness: Wilderness protects watersheds that provide clean drinking water to surrounding communities. Wilderness filters and cleans the air we breathe. Many animals we love call wilderness their home.
D) the brand new mercedes i won in a raffle is nice.
