Which method of heat transfer causes ice to form on roads in the winter

Conduction, simply put, is the transfer of heat through matter. The most important and oft misunderstood concept to remember with conduction is that heat travels from hot to cold. Often, property owners and contractors confuse heat with hot air. Hot air rises, but heat flows from hot to cold, regardless of direction.

it's c. (to reduce the greenhouse effect/carbon gasses)