Water readily dissociates ionic compounds, dissolves polar covalent molecules, and hydrates the smaller particles. This is most likely because water

The answer is a. i hope this

Ibelieve the answer is relative humidity  because it makes more sense that way. solar flares usually occur in space it doesn't affect the earth, well it could but it wont make a significant damage.  latitude is land it doesnt do anything. prevailing winds, i dont know the correct meaning for this but i doubt that affects the land so it has to be relative humidity.