Concept:Soil conservation means preventing soil erosion and maintaining soil fertility.Explanation:Strip-cropping involves planting different crops in alternating strips along the natural contours of the land.This method slows down running water and reduces soil erosion.It also helps maintain soil nutrients because different crops use and replace different nutrients.Monoculture, mechanization, and floriculture do not directly protect the soil from erosion.Answer:Strip-croppingSo the correct option is C.