When you enter a roundabout, you must yield to:

Answer: B — Traffic exiting the roundabout

When entering a roundabout, you must yield to traffic exiting the roundabout. This means that before entering, you must wait for any vehicles that are already in the roundabout to exit before proceeding. This ensures a smooth flow of traffic and avoids accidents. Pedestrians do not have the right of way in a roundabout, so A is incorrect. C is incorrect because you have the right of way over vehicles entering the roundabout. D is incorrect because oncoming traffic in the roundabout also has the right of way over you. This is why B is the correct answer in this scenario.