What is the recommended safe following distance?

Answer: A — Four seconds

The recommended safe following distance is four seconds. This gives you enough time to react in case of sudden stops or changes in traffic conditions. Option B is too short and may not leave you enough time to brake safely. Option C is also too short and may not give you enough time to evade any hazards on the road. Option D is also too short and may not leave you enough space to react in case of emergencies. It is always important to maintain a safe following distance to ensure the safety of yourself and those around you on the road.