In foggy conditions, which of the following should you avoid using?

Answer: B — High-beam headlights

In foggy conditions, using high-beam headlights should be avoided because these lights can cause a significant amount of light to reflect off the fog, rain, or mist and back into your eyes. This reflection creates a bright glare that can obscure visibility rather than enhance it, making it more challenging to see the road and any obstacles ahead. Instead, low-beam headlights or fog lights are recommended in such conditions because they provide adequate illumination without causing excessive glare. This ensures that you can see the road clearly while also being visible to other drivers.