What must a driver do when making a left turn at an intersection?

Answer: B — Follow the right of way rules

When making a left turn at an intersection, it is crucial for a driver to follow the right-of-way rules. This ensures that the driver yields to any oncoming traffic or pedestrians that may have the right of way before completing the turn. Adhering to these rules promotes safety and helps prevent collisions at intersections, which are common points of accidents. In many situations, the driver should look for oncoming vehicles and any traffic signals that may govern the turn. The act of carefully observing the traffic conditions allows for a smoother and safer turn. Meanwhile, the other options suggest actions that could lead to dangerous situations. For instance, turning sharply without checking could result in not seeing approaching vehicles. Similarly, quickly accelerating into traffic without confirming that it's safe can also lead to accidents. Waiting for a traffic light might only be applicable at controlled intersections and does not always address the responsibility to yield to other road users. Following the right of way rules is the foundational principle that governs safe left turns, making it the most appropriate choice in this scenario.