When are drivers required to use headlights?

Answer: D — At sunset until sunrise and in certain weather conditions

Drivers are required to use headlights at sunset until sunrise and in certain weather conditions because visibility is crucial for safety in low-light environments. Headlights help illuminate the road ahead, making it easier to see other vehicles, pedestrians, and obstacles that may not be visible otherwise. Additionally, headlights are essential during poor weather conditions such as rain, fog, or snow, when visibility is significantly reduced. This requirement ensures that all road users can see and be seen, enhancing safety on the road. The other options do not encompass the full range of circumstances where headlight usage is mandated, as they either restrict usage to a narrower time frame or context, not accounting for the variations in visibility that can occur during inclement weather or other conditions that necessitate the use of headlights for safety.