The correct option is D Both A and B
Soil erosion can be prevented by:
(i)
Intensive cropping means growing of more crops in the same fields and
not leaving them unused. If the fields remain covered with crops
throughout the year, top soil will not be exposed to winds or rains.
Thus, no soil erosion will occur.
(ii) In
hilly regions, small fields are formed in the form of steps or terraces
for cultivation of crops. Such a farming in hilly regions Is called
terrace farming. This technique reduces the flow of rain water down the
slopes of hills. Moreover, eroded soil from upper regions of hills gets
deposited in lower terraces. In this way, soil erosion can be prevented in hilly regions.
So, the correct answer is 'Both A and B'.