Which of the following corrects the pronoun error in this passage?

The sixth-grade students liked volunteering their time to read to the elderly people in the hospital. It made them happy.

A.The sixth-grade students liked volunteering his or her time to read to the elderly people in the hospital. It made them happy.
b. The sixth-grade students liked volunteering their time to read to the elderly people in the hospital. It made the volunteers happy.
c. The sixth-grade students liked volunteering their time to read to the elderly people in the hospital. They made them happy.
d.The sixth-grade students liked volunteering their time to read to the elderly people in the hospital. Reading made them happy.

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