单项选择题

[听力原文]
W: There’re a lot more people than usual in the departure hall.
M: The plane was to take off at 9:30 a.m., but half an hour before boarding, the passengers heard the announcement that their flight would be delayed until 10:50 a.m. due to stormy weather.

How long was the plane to be delayed（）

A. 30 minutes.
B. 50 minutes.
C. 70 minutes.
D. 80 minutes.

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