Concept:Wind erosion is best controlled by reducing wind speed at ground level with vegetation barriers.
Explanation:Wind erosion happens when strong winds carry away loose topsoil from bare land.
Re-afforestation means planting trees again in deforested or bare areas.
These trees act as windbreaks and slow down the wind near the land surface.
Slower winds cannot lift or move soil particles easily.
Inter-cropping, contour ploughing, strip cropping, crop rotation, and manuring mainly help in water erosion control or soil fertility improvement.
These methods do not directly stop the force of the wind on exposed soil.
Therefore, the method that directly checks wind erosion is planting trees to act as windbreaks.
Answer:A. re-afforestation and planting of trees on wind break