When must headlights be used while driving?

Answer: B — From sunset to sunrise

The requirement to use headlights from sunset to sunrise is grounded in safety regulations aimed at ensuring visibility during the hours of darkness. At night, natural light is significantly reduced, making it harder for drivers to see the road, other vehicles, and pedestrians. Therefore, using headlights improves visibility for both the driver and for others on the road, enhancing overall safety. While headlights are often needed during the day in conditions of reduced visibility, such as rain or fog, the specific regulation emphasizes their use during nighttime hours. This clarification helps drivers understand that the proper use of headlights is vital, particularly after sunset when the risks associated with low visibility are increased. For the other choices, daytime driving without adverse weather conditions does not typically require headlights, and using them at all times while unnecessary can cause glare and distract other motorists.