What should a rider do if they encounter a gravel road?

Answer: B — Reduce speed and exercise caution

When a rider encounters a gravel road, reducing speed and exercising caution is vital for safety. Gravel surfaces can be loose and unstable, which affects the motorcycle's handling and traction. By slowing down, the rider allows for better control and reaction to any unexpected changes in the road surface, such as potholes, loose stones, or ruts. Exercising caution means being vigilant about potential hazards that might not be present on paved roads, including the possibility of losing grip while taking corners or during sudden maneuvers. This approach significantly decreases the risk of skidding or a loss of control, contributing to a safer riding experience. Maintaining speed, attempting to brake aggressively, or steering aggressively may lead to accidents, as these actions can lead to loss of traction on the gravel. Thus, the correct response emphasizes the importance of adjusting riding behavior specifically for challenging terrain.