Choose the sentence with the apostrophes used correctly.

A. The teacher was frustrated because all the boys’ coats were left in a pile in the classroom’s coat room.

B. The teacher was frustrated because all the boys coats were left in a pile in the classrooms coat room.

C. The teacher was frustrated because all the boy’s coats were left in a pile in the classrooms’ coat room.

D. The teacher was frustrated because all the boy’s coats were left in a pile in the classrooms coat room.