Read the sentence. Nikita would like to know which car belongs to Yosef and Taiga. Which sentence revision correctly uses a possessive pronoun?

“Theirs” is a possessive pronoun that shows the car belongs to Yosef and Taiga. “Nikita would like to know which car is theirs” correctly uses it; “them” in choice C is an object pronoun, not a possessive pronoun.

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