21. Motorcycle riders have to abide by the law because
(A) otherwise they will be fined.
(B) it is the honorable, responsible, and safe thing to do.
(C) the police or security cameras might be watching.
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統計: A(1), B(1), C(0), D(0), E(0) #2215310
統計: A(1), B(1), C(0), D(0), E(0) #2215310