W: I want to mail this letter overseas. M: OK, Ma'am. I'll have to weigh it first. All right, it's not over- weight. That's 5.5 yuan for overseas mail. W: That's not expensive. How long does it take for a letter to get to the U. S.? M: It all depends. It usually takes four or five days. W: That's wonderful. It used to take more than a week when I was staying here six years ago. Well, I want to register it. M: All right. It's probably take a little longer to get there though. W: Yes, I know. Well, please let me have a post office box. M: That's OK. Fill out this form, please. W: How much is the rent per month? M: It's 100 yuan per year. W: Here is the form and money. M: OK. Here is the key for you. The number is on it. Any more requests? W: No, Thank you., Question: What is NOT mentioned in the conversation? (A) An overseas mail. (B) A registered letter. (C) A parcel.
(C) A parcel.