At a flashing yellow traffic light, you should:

Answer: B — Proceed with caution

At a flashing yellow traffic light, you should proceed with caution. This is because a flashing yellow light indicates that you should slow down and be prepared to stop if necessary. It does not mean that you must come to a complete stop like a flashing red light. Option A, which suggests stopping and proceeding only when safe, is not the correct choice because stopping at a flashing yellow light is not necessary unless it is unsafe to continue. Option C, which advises speeding up, is not the correct choice because it goes against the purpose of a flashing yellow light, which is to indicate caution and preparedness to stop if needed. Option D, which mentions yielding to oncoming traffic, is not the correct choice because at a flashing yellow light, you should proceed with caution rather than yielding to oncoming traffic.