[单项选择]

One silly question I simply can’t understand is "How do you feel" Usually the question is asked of a man in action—a man on the go, walking along the streets, or busily working at his desk. So what do you expect him to say He’ll probably say, "Fine, I’m all right," but you have put a bug (小虫子) in his ear—maybe now he’s not sure. If you are a good friend, you may have seen something in his face, or his walk, that he overlooked (忽略) that morning. It starts worrying him a little. First thing you know, he looks in a mirror to see if everything is all right, while you go merrily on your way asking someone else "How do you feel" Every question has its time and place. It’s perfectly acceptable, for instance, to ask "How do you feel" if you’re visiting a close friend in the hospital. But if the fellow is walking on both legs, hurrying to take a train, or sitting at his desk working, it’s
A. a man working at his desk
B. a person having lost a close friend
C. a stranger who looks somewhat worried
D. a friend who is ill