Pl 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.

the sixth-grade students liked volunteering his or her time to read to the elderly people in the hospital. it made them happy.
the sixth-grade students liked volunteering their time to read to the elderly people in the hospital. it made the volunteers happy.
the sixth-grade students liked volunteering their time to read to the elderly people in the hospital. they made them happy.
the sixth-grade students liked volunteering their time to read to the elderly people in the hospital. reading made them happy.

The sixth-grade students liked volunteering their time to read to the elderly people in the hospital. It made the volunteers happy. This is the most accurate.

the author is intending to draw attention to the plight of refugees, editorial and biography support this. both workpieces make the reader empathize with enrique as well as with the other young migrants from central america. the writer, however, is using a different approach to each text.

the editorial includes strong words to persuade readers. he is trying hard to convince readers in the us to change its refugee approach.

the biography relies on narrative techniques and figurative language which the writer uses wisely in the setting, characterization, and personification to educate readers on the topic.