Detailed Instructions: In this task, you will be shown a conversation. You need to write a question with three choices for the conversation. Your question should be answerable based on the conversation and only have one correct answer. Note that you don't need to answer your question. "W" and "M" in the conversations stand for "woman" and "man".
Problem: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!
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
How long has Jessica's mother been dancing? (A) For 20 years. (B) For 23 years. (C) For 43 years.