Final answer:
You should slow down and watch for ice on the road when temperatures are below freezing. Using winter tires enhances friction and therefore traction, and spreading salt on roads helps melt ice to make the surface safer to drive on.
Step-by-step explanation:
When temperatures are below freezing, the safest option would be B. Slow down and watch for ice on the road. Driving in cold, icy conditions requires extra precaution due to the increased risk of encountering black ice and other slippery surfaces that can cause your vehicle to skid or lose control. Additionally, having appropriate winter tires can create more friction between your vehicle and the road surface, improving traction. Trucks spreading salt on the roads is another example where increasing friction is desired, as the salt helps to lower the freezing point of water, which can assist in melting ice or prevent it from forming, thereby providing a safer driving surface.
It is not advisable to drive as you normally would (A) or to turn on high beams (C), because high beams can cause glare and make it harder to see in snowy conditions. Accelerating to maintain tire traction and control (D) is typically not recommended as it can lead to loss of vehicle control and dangerous driving situations.