When approaching a steady circular yellow traffic signal, what should you do?

Answer: B — Slow down

Approaching a steady circular yellow traffic signal means that the next signal will either turn red or green. In such a situation, stopping suddenly can be dangerous as the car behind you may not be prepared for it. Yielding is not necessary as there is no intersection ahead. Keeping going would only be appropriate if there is no obstruction on the road. Therefore, the best course of action is to slow down and prepare to stop if the signal turns red.