题目内容：
Questions refer to the following e-mail.To: Marketing Department <marketing@fbgroup.net>
From: Federico Botella <fbotella@fbgroup.net>
Date: January9
Subject: Sales Meeting
We need to postpone the sales meeting that I had arranged for January 15. I have a meeting with a client in Cancun on January 14, and I was not able to get a flight back to Houston until January 16. I'm sorry for any inconvenience this may cause you. The meeting is now tentatively rescheduled for 9 A.M. on January 18 in the conference room.
What is the purpose of this e-mail? A．To schedule a conference
B．To reschedule a meeting
C．To introduce a new client
D．To announce vacation plans
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答案解析：