Choose one sentence that has the same meaning as the root one:
Unless you have a driving licence, you aren’t allowed to ride a motorbike.
A. Anyone who doesn't have a driving licence mustn't ride a motorbike.
B. You can ride a motorbike without a driving licence.
C. If you don't have a driving licence you shouldn't buy a motorbike.
D. The only people allowed to ride a motorbike must be over 18.