How should drivers use headlights in conditions of low visibility?

Answer: C — Use low beams

In conditions of low visibility, using low beams is the recommended practice for drivers. Low beams are designed to illuminate the road directly in front of the vehicle without reflecting off rain, fog, or snow, which can occur with higher beams. This helps to maintain visibility for the driver while reducing glare for other drivers and pedestrians. High beams are intended for clear, dark conditions and can create significant glare and reflections in poor weather. Daytime running lights, while helpful for making a vehicle visible during the day, do not provide adequate illumination for nighttime driving or in conditions such as fog or heavy rain. Turning off the headlights entirely is unsafe and could lead to severe visibility issues. Therefore, using low beams is the most effective choice for ensuring safety and visibility in low visibility conditions.