[ Grammar ]
Which sentence is written correctly?
A. The librarian needed his computer to check in the books, so when the power went out, they could not do their job.
B. The librarian needed his computer to check in the books,so when the power went out, he could not do their job.
C. The librarian needed his computer to check in the books, so when the power went out, they could not do his job.
D. The librarian needed his computer to check in the books, so when the power went out, he could not do his job.
Select your answer:

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