Correct Answer:
C. are
The correct answer is C) are. This question tests subject-verb agreement, specifically with relative pronouns.
- The key to understanding this sentence lies in identifying the antecedent of the relative pronoun "who." The phrase "one of the best students" indicates that "who" refers to "students," not "one."
- If the sentence were "She is the only one of the best students who...", then "who" would refer to "one," and the singular verb "is" would be correct. However, in the given sentence, "She is one of the best students who...", "who" refers to the plural noun "students."
- Since "students" is plural, the verb that follows "who" must also be plural. Therefore, "are" is the correct choice to agree with the plural subject "students."
- A) is: Incorrect, as "is" is a singular verb and does not agree with the plural antecedent "students."
- B) was: Incorrect, as "was" is a singular past tense verb and does not agree with the plural antecedent "students."
- D) has: Incorrect, as "has" is a singular verb and does not agree with the plural antecedent "students."
Thus, the sentence correctly reads: "She is one of the best students who are always punctual."