Correct Answer: D
Explanation:
In this sentence, it is easy to think that "it" refers to "cleaning crew," but since "cleaning crew" appears as the object of the preposition "of the cleaning crew" in the subject "the members of the cleaning crew," the plural noun "members" is actually the referent of the singular pronoun "it." To correct the sentence's error, "it" should be changed to "they," which agrees with plural antecedents. The corrected sentence reads, "The members of the cleaning crew made the event enjoyable and safe for all, and they deserve our thanks."