What should be your first action when driving in fog?

Answer: B — Reduce speed and use low-beam headlights

When driving in fog, the first action you should take is to reduce your speed and use low-beam headlights. Fog can significantly reduce visibility, making it difficult to see both the road and other vehicles. Slowing down allows you to respond more effectively to any obstacles or changes in traffic conditions. Using low-beam headlights is crucial because high-beam headlights can reflect off the fog and create a glare that actually reduces visibility further. Low beams, on the other hand, are angled down and illuminate the road immediately in front of your vehicle without causing excessive reflection from the fog. This combination of reducing speed and adjusting your headlights helps ensure that you can navigate safely through foggy conditions. Pulling over and waiting for the fog to clear is an option some drivers might consider, but it may not always be practical or safe, especially if you're in a location where stopping could create a hazard. Increasing speed is certainly not advisable as it can lead to losing control and increasing the risk of accidents due to limited visibility.