He understood that the men were very close to him when they coughed.

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He realized the men were very close to him when they coughed.He had come to realize the men were very near to him when they coughed.It was understood by him that the men were quite close when they coughed.He is realizing the men were very near to him when they coughed.None of the above

Explanation

Option C correctly uses the passive voice and past tense to convey that he became aware of the men's proximity upon hearing them cough. The other options either misuse tense, voice, or contain grammatical errors.