A、Their colleague. B、Their job. C、A job vacancy. D、A want ad. D本题问“说话者在讨论什么”。文中“advertise a post of Retail Manager”是他们围绕的话题，也就是说

M: What about this post of Retail Manager we’re going to advertise, Joan? What kind of person are we looking for?
W: Well, it’s a job which requires a sense of responsibility and independence, since the person selected will be running, at the start at any rate, will be running ten stores with about 100 staff.
M: And with the possibility of expanding to 15 stores and 150 staff.
W: Right. So there’s plenty of scope for initiative and energy... and of course, hard work.
M: So at the moment we’re looking for someone who’s responsible, independent, dynamic, hardworking and has initiative...
W: That’s it. But also someone who is able to deal with upwards of a 100 or a 150 staff.
M: So someone sensitive, tactful and articulate. Wait a minute, why does it have to be a man?
W: Sorry, he or she... Yes, OK, so this is very much a job requiring people skills, so I’d personally like to see someone who’s had quite a lot of experience as a team leader.
M: OK. Now, this is a retail job — and a pretty high-powered one at that — so I guess we want someone with a certain amount of retail experience.
W: Absolutely, and not just a certain amount, either. Whoever we chose should have a substantial amount of experience in retailing.
M: Just a minute, what do you mean by "a substantial amount"? Five, ten, 20 years?
W: Well, I think he — sorry, he or she — would have to be at least 30.
M: Yeah, OK. So we’ll put in the advertisement "proven track record as a retail manager".