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What do you understand by contour ploughing?

A)  The process of ploughing parallel to the contours of a hill slope to form a natural barrier to stop water from flowing down the slope.

B)  The ploughing on the broad flat steps on steep slopes to reduce surface runoff and soil erosion.

C)  It is a method of ploughing in which soil, grass and stones are used along the contour and trances are made in front of them to collect water.

D)  It is a method of ploughing in which different crops are grown in alternate rows along the contours to protect the soil from rain wash.

E)  None of these