How should a driver/operator manage a vehicle on steep grades?

Answer: B — Use lower gears to control speed

Using lower gears to control speed on steep grades is essential for ensuring vehicle control and safety. When descending a steep incline, maintaining a safe and manageable speed is crucial. Lower gears allow for engine braking, which helps slow the vehicle down without relying solely on the brakes. This is important because continuous braking can lead to brake overheating or failure. Additionally, utilizing lower gears provides more torque and power, allowing the vehicle to ascend steep grades without stalling or losing traction. It also helps prevent the vehicle from accelerating uncontrollably on descents, thereby enhancing overall control and stability. In contrast, accelerating to maintain momentum can lead to an unsafe situation if the incline becomes too steep, as it might cause the driver to lose control. Turning off the engine to conserve fuel poses risks by disabling engine braking and diminishing control over the vehicle, while keeping the vehicle in neutral eliminates the ability to use engine braking altogether, which is critical on steep grades for maintaining a safe speed.