听力原文：W Yesterday when we spoke, I thought the 600,000 dollar insurance policy was best

, but after thinking about it some more, I really think 500 will be enough. Is it too late to change it？

M I already mailed the paperwork, but it's really not a problem. You're approved for the larger amount, so you can always back off and purchase a cheaper policy.

W And what about the check I wrote you？ That was for the more expensive policy.

M Don't worry. When our payment office receives it, they'll apply the difference as a credit towards the next payment.

Who most likely is the man？

A．A postal worker

B．An insurance agent

C．An accountant

D．A client