All head lamps must work properly:

Answer: C — In all situations

Headlamps are essential for vehicle safety and visibility in various driving conditions. They must be operational at all times to ensure that drivers can see clearly and be seen by others, regardless of the time of day or the type of road being traveled. This includes city driving, night driving, and highway driving. Properly functioning headlamps contribute to overall road safety, helping to prevent accidents caused by poor visibility. While there are specific legal requirements regarding when to use headlamps, such as during inclement weather or nighttime driving, the necessity for them to function effectively applies universally. Thus, having all headlamps working properly is critical in all situations, ensuring that drivers are equipped to handle any condition they may encounter on the road.