Pronoun-antecedent agreement

12a. When a driver wants to buy a new vehicle, he or she usually test drives them.

12b. When a driver wants to buy a new vehicle, he or she usually test drives it.

My answer is: 12b

Yes, that is correct.

Right.

The correct answer is 12a. In this sentence, the pronoun "he or she" is used to refer to the driver. Since "driver" is a singular noun, the pronoun that refers to it should also be singular. Therefore, "them" in option 12a is incorrect because it is a plural pronoun. Instead, the correct pronoun should be "it" to maintain agreement in number. So, the correct sentence is: "When a driver wants to buy a new vehicle, he or she usually test drives it."