A、He is always optimistic about everything. B、He is extremely careful in his diet. C、He sees his doctor as soon as he falls ill.

M: I hear you have got a role in a play. How on earth did you get it?
W: Well, when I heard the role was coming up, I read the book until I could learn the lines by heart and understood the character, and I had an interview and got it.
Q: How did the woman get the role in the play?

W: You seem to have had perfect health all your life.
M: Yeah. I don’t remember ever having to see a doctor. I eat healthy food and take plenty of exercise. Most of all, I look at the sunny side even when things aren’t going so well.
Q: What is the most important reason for the man’s perfect health?