It's D because you're being compassionate and every other answer makes no sense:
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But he doesn't feel healthy...he's been coughing for 6 months, with blood for a week. If I were him, I'd think something was really wrong with me, and that I was certainly NOT healthy...By telling him it must be hard, yeah, it's compassionate, but you're not answering his question at all. He asked you, "How can this be happening to me?"