What is a safe practice when driving in foggy conditions?

Answer: B — Use low-beam headlights and reduce speed

Using low-beam headlights and reducing speed is the safest practice when driving in foggy conditions. Low-beam headlights are designed to project light downward, which reduces the amount of light that reflects off the fog and back into the driver's eyes. This helps maintain visibility and allows for better control of the vehicle. Additionally, reducing speed is crucial because fog can significantly decrease visibility, making it harder to react to obstacles, other vehicles, or changes in the road. Slowing down gives drivers more time to think and respond to potential hazards, increasing overall safety on the road during such challenging weather conditions. The other practices suggested, such as using high-beam headlights or turning on hazard lights, can impair visibility and communicate confusion to other drivers, while keeping headlights off altogether would limit visibility even further.