Soil & water conservation method mostly used in hilly & mountain areas is?

Correct option is A

Contour bunding is the most commonly used soil and water conservation method in hilly and mountainous areas. It involves constructing small embankments along the contour lines of the land, which helps in slowing down the flow of water, reducing soil erosion, and promoting water infiltration. This method is effective in preventing soil loss on sloping terrains, making it a preferred choice for conservation practices in such regions.