Concept:Soil erosion can be reduced by farming methods that slow down water flow and protect the soil surface.
Explanation:Overgrazing removes vegetation that holds soil together, so it increases erosion.
Deforestation and bush burning also expose the soil to wind and water, making erosion worse.
Contour ploughing means ploughing across the slope, along the contour lines, instead of up and down the slope.
The ridges formed trap rainwater and reduce the speed of runoff, allowing water to soak into the soil.
This practice therefore helps to control soil erosion effectively.
Answer:B. Contour ploughing