A、Two. B、Three. C、One. D、Four. A男士说只有他和Brine会参加，所以答案是Two。

M: Hello, Mary. I was hoping to speak to Helen.
W: Sorry, Helen’s away on business. Can I help?
M: Yes, Mary, I think you probably can. I’m afraid I’ve got some rather bad news.
W: Oh?
M: It’s the trip over for Electronica.
W: Uh-huh?
M: Yes, I’m afraid we’ve had a bit of an internal reorganization here and we’ll be sending a much smaller team.
W: You will still be having the same booth at the fair, won’t you?
M: I’m afraid not. There’ll be just Brine and myself so we won’t be able to manage such a large booth.
W: Well, I can’t promise that they’re going to have any smaller booths available at this late date ...
M: Yes, I realize that. But could you see what you could do? You know, Mary, you’ve done a terrific job so far.
W: We’ve certainly put a lot of work into it. I hope this doesn’t mean you’re canceling the reception at Caesar’s Restaurant?
M: Not canceling it, but I think we’ll have to reduce the scale a bit.
W: The problem is that all the arrangements have all been made and confirmed. We’ve already given a deposit for the food and wine. I don’t know ... this may be difficult to change ...
M: Yes, I know, I’m sorry, but these things happen. I think I’d better talk to Helen.
W: Yes, I think you should.