What should you do if you see a yellow traffic light?

Answer: A — Slow down and be prepared to stop

When you see a yellow traffic light, it is a warning that the light is about to turn red. Therefore, you should slow down and be prepared to stop to avoid running the red light. Option B, stopping and looking both ways, is incorrect because stopping on a yellow light can cause potential accidents or hinder the flow of traffic. Option C, increasing your speed, is incorrect as it goes against the purpose of a yellow light to warn drivers to prepare to stop. Option D, accelerating and crossing the intersection, is incorrect as it puts you in danger of running a red light and causing accidents.