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If you see lights ahead while driving in fog

A The lights may not indicate where the road is as the vehicle may have pulled off the roadway
Explaination
When driving under foggy conditions, lights cannot be taken as a reliable indication of where the road is. The lights may be coming from a vehicle that has pulled off the road.
B You can assume the lights are on the road
C It may be a reflection
D It may be an optical illusion