Answer and explanation

Correct answer: B. The students are studying in the library.

  1. Step 1: A plural subject takes "are", and the present continuous needs the -ing form.
  2. Step 2: "Are studying" is correct.
Answer
The students are studying in the library.
Why not the others: "Is" does not agree with a plural subject, and the other two lack the auxiliary or use the wrong verb form.

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