A、Caesar’s army. B、Give up smoking. C、Hypnotism. D、Ordinary life. C整篇对话都是围绕催眠疗法展开，所以选C。

M: Good morning, Percy.
W: Trevor, you have one of the most unusual stories I’ve ever heard. Yet, nowadays, you seem to lead a very ordinary life.
M: Yes, Percy. I’m a dentist. I live and work in London.
W: But at one time you used to have a different job?
M: Yes, I was a soldier.
W: A soldier?
M: That’s right.
W: And how long ago was that?
M: Oh, about two thousand years ago.
W: That’s right. Trevor Cartridge believes that he was a soldier in the army of Julius Caesar. He remembers coming to Britain with the Roman army two thousand years ago. Trevor, tell us your remarkable story ... in your own words!
M: Well, funnily enough, it all began because I wanted to give up smoking.
W: Give up smoking?
M: Mm, I used to smoke too much and I tried to give up several times, but I always started smoking again a few days later. In the end I went to a hypnotist.  He hypnotized me, and I stopped smoking at once I was delighted, as you can imagine.
W: Yes.:
M: That made me very interested in hypnotism, and I talked to the hypnotist about it. He told me that some people could remember their past lives when they were hypnotized, and he asked if I wanted to try. I didn’t believe it at first, but in the end I agreed. He hypnotized me, mid sure enough I was a Roman soldier in Caesar’s army.
W: You didn’t believe it at first?
M: I didn’t believe it before we tried the experiment. Now I’m absolutely convinced it’s true.