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Contour bunding is a method of soil conservation used in

 Contour bunding is a method of soil conservation used in
(a) desert margins, liable to strong wind action
(b) flat piains, close to stream courses, liable to flooding
(c) scrublands, liable to sPread of weed growth
(d) None of the above
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It takes 10 days for digging a trench of 100 m long, 50 m broad and 10 m deep. What length of trench, 25 m broad and 15 m deep can be dug in 30 days ?

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