Choose one sentence that has the closest meaning to the root one:
Those who are riding a motorbike are not allowed to take off their helmet.
A. Those who are wearing a helmet are not allowed to ride a motorbike.
B. It is the helmet that one needn't wear when he is riding a motorbike
C. You should not wear a helmet when you are riding a motorbike.
D. People must never take their helmet off while they are riding a motorbike.

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