When you approach a roundabout, traffic must _______.

Answer: C — Yield to the right

When approaching a roundabout, you must yield to the right, meaning that you must give the right of way to drivers already in the roundabout and wait for a safe gap to merge into the traffic flow. Stopping is not necessary unless there is traffic in the roundabout or you need to yield to a pedestrian. Going to the left or reversing are not correct as they would go against the traffic flow and disrupt the flow of the roundabout.