What is an appropriate action when encountering a sudden heavy rain causing slippery roads?

Answer: C — Slow down and avoid fast turns and stops

When encountering sudden heavy rain that causes slippery roads, the best action is to slow down and avoid making fast turns and sudden stops. This choice is correct because slowing down helps maintain better control of the vehicle on slick surfaces, reducing the risk of hydroplaning, skidding, or losing traction. Adjusting speed allows for more reaction time to unexpected changes in road conditions or obstacles. Making sharp turns or sudden stops can lead to loss of control, as wet roads significantly decrease tire grip. Maintaining a cautious approach during adverse weather conditions is crucial for ensuring safety, both for the driver and other road users.