W: Hi, Jack, have you thought about your ideal job in the future? Do you want to be an excellent math teacher like your father? M: For Gosh's sake! I hate being a teacher. I still have a clear memory of the terrible days when my father helped me with all my subjects. But it is strange that I made great progress in my English learning. How about you, Jessica? W: Well, I dream of being a brilliant dancer like my mother. You know, she is 43 now, and she has been dancing since she was 20 years old. M: I can't believe it! She looks quite young and has a great figure. W: Yes. She has formed a good habit of having enough fruits and vegetables every day. And more importantly, she keeps an optimistic attitude towards life which benefits her physical condition. M: Oh, I see. How I wish I had taken enough exercise. W: Come on. Don't lose heart! If you think you can, you can. Let's get rid of our bad habits and learn from our great parents. M: Why not do it right now? Shall we swim this afternoon? W: With pleasure!, Question: Jessica's mother is in good condition, and what contributes to this more? (A) Having an optimistic attitude towards life. (B) Fruits and vegetables. (C) Taking enough exercise.
(A) Having an optimistic attitude towards life.