In foggy conditions, you should...?

Answer: C — Increase your following distance

In foggy conditions, visibility is significantly reduced, which means it is harder to see the road and other vehicles. Increasing your following distance allows you more time to react and stop safely if the vehicle in front of you suddenly slows down or comes to a stop. Decreasing your following distance would be dangerous as you would have less reaction time and could potentially cause a collision. Maintaining your usual following distance is also not recommended as it may not provide enough safety buffer in case of sudden stops or other hazards on the road. Following closely to the vehicle ahead should never be done in any condition, especially in foggy conditions where visibility is limited and the risk of a collision is higher. It is always important to maintain a safe following distance to ensure the safety of yourself and other drivers on the road.