When another vehicle is passing you, what should you do?

Answer: C — Maintain a constant speed

Maintaining a constant speed when another vehicle is passing you is an important practice for safety on the road. By keeping your speed steady, you help ensure the passing vehicle can complete the maneuver safely and efficiently without having to worry about unexpected changes in your speed. When you speed up, it can create a dangerous situation, as it may lead to the passing vehicle trying to overtake you at a higher speed than intended, which increases the risk of a collision. Changing lanes can also be risky if not done cautiously, especially if there are other vehicles in adjacent lanes. Lastly, pulling over is not typically necessary unless you're in a situation where it's safe and appropriate to do so, such as if you're on a narrow road or in heavy traffic. Maintaining a constant speed is the safest approach in most passing situations, allowing both you and the other driver to navigate safely.