Help Sarah sort out a laundry mix-up with her roommate. Choose the correct word to complete her sentence.

"I think this ridiculous polka-dot sweater is yours," laughed Sarah. "___ is the boring gray one."

The correct answer is Mine.

Mine is a possessive pronoun that replaces "my + noun" (in this case, "my sweater"). Because it replaces the whole noun phrase, it can act as the subject of the sentence. "My" cannot be used without a noun immediately following it.