What action should a driver take when being passed by a smaller vehicle?

Answer: C — Help them pass safely by reducing speed

When being passed by a smaller vehicle on the road, it is important for the driver to ensure the safety of both vehicles. Increasing speed or ignoring the smaller vehicle can potentially cause a dangerous situation. Signalling the smaller vehicle to stop passing can also be risky and potentially cause confusion. The best course of action would be to reduce speed and allow the smaller vehicle to pass safely. By slowing down, the driver is able to create a safer and smoother passing experience for both themselves and the smaller vehicle.