What should you do when approaching a roundabout?

When approaching a roundabout, it's important to yield to traffic already in the roundabout. This is crucial because vehicles within the roundabout have the right-of-way, which helps maintain a smooth and safe flow of traffic. By yielding, you allow yourself to integrate safely into the circulating traffic, reducing the risk of collisions.

Option A, which suggests stopping completely before entering, is not ideal because it can disrupt the flow of traffic and create hazards if vehicles behind you are not expecting it. Similarly, options B and D present risks by either accelerating without assessing the situation properly or entering without ensuring safety due to lack of visibility. Yielding to the traffic in the roundabout is the correct approach, allowing for a safer merging into the flow of vehicles.