When encountering steep grades, what should a driver do?

Answer: B — Reduce speed and use lower gears.

When encountering steep grades, reducing speed and using lower gears is crucial for maintaining vehicle control and safety. Lower gears provide more power and better engine response, allowing for controlled descent and ascent. This practice helps prevent the vehicle from accelerating too quickly on downhill grades, which can lead to loss of control and increased stopping distances. Using lower gears allows the engine to help slow down the vehicle, reducing reliance solely on the brakes, which can overheat and degrade in effectiveness over long descents. By keeping the speed manageable, the driver enhances their ability to respond to sudden changes in road conditions or obstacles. On uphill grades, utilizing lower gears helps to prevent the engine from laboring excessively, ensuring that the vehicle has the necessary power to climb without stalling. This also increases fuel efficiency as the engine operates in a more optimal power range. Overall, this strategy significantly contributes to safer driving on steep inclines and declines.