How much can dirty headlights reduce light output by?

Answer: B — 75 percent

Dirty headlights can significantly impair visibility while driving, reducing light output by up to 75 percent. This considerable decrease occurs because dirt, grime, and other substances on the headlight lens obstruct the beam of light from properly projecting onto the road. As a result, not only does it affect the driver's ability to see clearly, but it also impacts the visibility of the vehicle to other drivers and pedestrians. Maintaining clean headlights is essential for safety, as it ensures maximum light output and enhances road illumination during nighttime or adverse weather conditions. Proper maintenance and regular cleaning can greatly improve overall visibility and driving safety.