Question

5. When driving in fog or snow, __________ A. use your high beams. B. use your low beams. C. drive at the posted speed limit.

Answer 1

The answer is, "B", "Use your low beams". 
Low-beams are the lights that are under your regular headlights, and assist you in the seeing the ground, rather than in front of you, perfect for fog and snow storms.

Answer 2

The answer is B. Use your low beams.

Hope this helps!! ;))
Have a grat day!! <3