Which sentence has correct subject-verb agreement?

Answer and explanation

Correct answer: C. The group of students was waiting outside the classroom.

  1. Step 1: The subject is 'group', a singular noun.
  2. Step 2: A singular subject takes 'was'.
Answer
The group of students was waiting outside the classroom.
Why not the others: 'Were' and 'are' agree with 'students', which is not the subject; 'groups ... was' mismatches.

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