单项选择题

Good afternoon. This is your captain speaking. We have found a strong air current ahead for the next forty miles or so. Passengers are therefore strongly advised to remain in their seats with their seat belts on for their own protection and to avoid use of the rest rooms for the time being, if at all possible. During this time, young children should be firmly fastened into their seats.
Please observe these precautions until the seat-belt warning sign has gone off. Lunch will be served after we have passed through the air current zone. Thank you.

Why has the captain asked the passengers to keep their seat belts on().

A. The plane is going to land.
B. The plane is going to take off
C. The air might become very rough.

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