What word is best to substitute for the underlined words in the following sentence? Several nursing students stayed behind after class, but the instructor advised the students to ask questions during office hours.
Correct Answer: C
Rationale: The word 'they' is the best substitute for the underlined words in the sentence because it refers to the plural noun 'nursing students' and is used to indicate the subject of the sentence. Using 'they' maintains subject-verb agreement and clarity in the sentence.
Choice A 'them' is incorrect as it is used for objects, not subjects. Choice B 'him' is singular and does not agree with the plural noun 'nursing students.' Choice D 'those' is also incorrect as it refers to objects, not the subject of the sentence.