Which sentence uses the apostrophe correctly?

Answer and explanation

Correct answer: D. The students' books were left on the bus.

Answer: students'. Why not the others: An apostrophe before the s means one student; the others put the apostrophe on the wrong word.
  1. Step 1: For a plural noun ending in s, add the apostrophe after the s.
  2. Step 2: 'Students' books' means the books of several students.

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