What does a YELLOW traffic light mean?

Answer: C — Slow down and prepare to stop if necessary

A yellow traffic light is used as a warning signal, meaning that it is about to change to red. This option suggests that you should slow down and prepare to stop if necessary. Option A, speeding up, is not recommended as it can be dangerous and lead to accidents. Option B, stopping abruptly, is also not recommended as it can cause rear-end collisions. Option D, continuing at the same speed, is also incorrect as this does not take into account the potential hazards that may be present at the intersection. Therefore, option C is the safest and most appropriate response when approaching a yellow traffic light.