【正确答案】 B

【答案解析】[听力原文]
   W: Well, Mr. Smith, I've looked into your invoice and found out why it hasn't been paid.
   M: Why?
   W: We asked our bank to transfer the money but they couldn't. They said that your bank details were wrong. So they couldn't transfer the money then.
   M: What do you mean my bank details were wrong? They are printed on our invoice. I think that you receive the same invoice as all our other customers.
   W: I'm sorry. What did you say?
   M: I said our bank details were printed on the invoice.
   W: Well, I have the invoice here. Can we just check? The account number is 21406881. Is that right?
   M: Yes, that's right. And what about the name of the bank?
   W: At the Bank of Scotland at 46 Portland Street in...
   M: Hold on, did you say Bank of Scotland?
   W: Yes. What's the matter?
   M: It is the Royal Bank of Scotland, not the Bank of Scotland.
   W: You mean there are two different banks?
   M: Exactly.
   W: OK, Mr. Smith. I'll ask our bank to transfer the amount to the Royal Bank of Scotland as soon as it opens. I'm sorry about the mistake.
   M: Well, I'm glad we've sorted it out.
   What can we know about the invoice from the speakers?