Which sentence is punctuated correctly?

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1 point
“Please hand out the worksheets to the students’,” the teacher told me.
“That dog is the Jones,’ ” my neighbor said.
“Those backpacks are my sisters,” Callie said.
“Those science projects are the seventh graders’,” he instructed.

The third sentence is punctuated correctly: "Those backpacks are my sisters," Callie said.

The sentence that is punctuated correctly is: "Those backpacks are my sisters," Callie said.

The correct punctuated sentence is: "Those science projects are the seventh graders’," he instructed.