Indicate the sentence that is closest in meaning: Alan worked too

A. Because Alan worked too hard at the office, and this led to his illness.

B. Alan's working too hard at the office, and this led to his illness.

C. Alan's illness resulted from his working too hard at the office.

D. His working too hard at the office resulted from his illness.A. Because Alan worked too hard at the office, and this led to his illness.