W: Excuse me, my watch stopped running, and I am not sure what's wrong with it. M: Well, let me look at it. Hmm, it seems that it just needs a new battery. W: Oh, that's really. I got some water on it last week and I was afraid that it might ruin the watch. M: How much is a new battery? M: It's 6.99, and we not only change a battery but also guarantee it for a year. And if you have the watch cleaned here, we can guarantee it for an additional three months. W: That sounds like a good deal. I'll get my battery here. When will it be ready? M: Usually I can do it right away but now I'm repairing lots of watches and I am way behind. Can you leave your watch here until 5 PM? W: Okey, see you then., Question: What does the shop offer if one changes a battery there? (A) A free battery. (B) One-year guarantee. (C) Free cleaning service.
(B) One-year guarantee.