Question

The best combination for key earthen structures which may be used for controlling soil erosion inside of natural agricultural watersheds located in dry 'land areas are;

A Contour bunds, farm ponds, and land smoothening/levelling
B Graded bunds, Shelterbelts, and terracing
C Bench terracing, bigger check dams, and ground water dykes
D Diversion bunds, deep reservoirs and bench terracing
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