单项选择题

[听力原文]8-10
M: Good morning. This is Mary Brown of IMA Computers.
M: Hello. What can I do for you
W: I’ d like to order some computer monitors.
M: Yes. Which ones
W: The order number is C106
M: now many do you need
W: Three hundred, please.
M: One moment... Yes, we can supply them.
W: Could you send them by July 21st, please
M: Certainly.
W: Good, thanks.
M: Thank you. Good - bye.

How many computer monitors does the woman need（）

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