Even with a 0.00% bac, you may be arrested and charged with dui or dwi if you a. fail to signal before a turn b. had any alcohol to drink earlier in the day c. exhibit signs of impairment d. have a container of alcohol in your car

I would think it would be B which is probably the right answer.

I think the answer you are looking for is: B. Had any alcohol to drink earlier in the day.

Reason: Some states have something called zero tolerance. So for instance if you are at 0.00% BAC but the officer thinks you are not in a good state to drive because you had something to drink earlier than he can arrest you because later on you could become drunk and that officer is trying to make the roads safer. Better to be safe than sorry.