\read the sentence.

nikita would like to know which car belongs to yosef and taiga.

which sentence revision correctly uses a possessive pronoun?

nikita would like to know which car is theirs.
nikita would like to know which is him or her car.
nikita would like to know which car belongs to them.
nikita would like to know which car belongs to he or she.

it should be A

Explanation: theirs is describing he\she owns the car

If I'm wrong tell me thank you.

given the lack of choices, i'm gonna wing it and say that pushing your car off a cliff might not be the best idea. your car might sustain damage from the fall and will probably result in the car being too damaged to jump start.

if that's not good enough, avoid filling the car with bees. bees might get agitated when trapped or during the moving process, and might result in death or painful stings that will make jump starting your car very difficult. but in the event that you do choose to fill your car with bees, remember to wear protective gear!