Discussion
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;
Answer: A
The best combination is Contour bunds, farm ponds, and land smoothening/levelling.
In dry land areas the aim is to hold every drop of rain where it falls. Contour bunds run along the contour and hold runoff in the field so it soaks in, farm ponds harvest the excess for life-saving irrigation, and land smoothening spreads water evenly and prevents it collecting in low spots.
Graded bunds are meant to drain excess water safely in higher-rainfall areas, which is the opposite of what dry lands need. Bench terraces, big check dams, diversion bunds and deep reservoirs are costly structures for steep slopes or larger catchments, not the key in-field measures for dry lands.
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