Choose the sentence with correct subject-verb agreement after the phrase beginning with the number.

Answer and explanation

Correct answer: B. The number of students has increased.

  1. Step 1: "The number" is singular and takes "has".
  2. Step 2: The first sentence agrees.
Answer
The number of students has increased.
Why not the others: "Have" is plural; "a number of" takes a plural verb; "student" should be plural.

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