799.According to traffic regulations, apart from nighttime, when should a vehicleturn on the headlight? (A) Only when passing through tunnels or culvertswithout lighting; if lighting is provided, headlights may be turned off. (B) Whenpassing through tunnels, culverts, reversible lanes, or when encounteringdense fog or heavy rain that reduces visibility, headlights must be turned on.(C) When passing through well-lit underpasses, headlights may be turned offbecause the environment is sufficiently bright.