单项选择题

[听力原文]6-8
W: 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: How many do you need
W: Three hundred, please.
M: One moment... yes, we can supply them.
W: Could you send them by June 21st, please
M: Certainly.
W: Good. Thanks.
M: Thank you. Good - bye.
W: Good - bye.

How many computer monitors does the woman need（）

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