If you are not certain about the correct way to proceed, you should:
Answer: B — Ask law enforcement
If you are not certain about the correct way to proceed, the best course of action is to ask law enforcement for assistance. Driving fast may put you and others in danger and following other vehicles may lead you in the wrong direction. Acting on your own judgement may also not be the safest or most legal option. Law enforcement officers are trained to handle such situations and can provide the appropriate guidance or assistance. Therefore, option B is the best choice.