What is the purpose of the farming technique shown here?

a. to enable farmers to plant a new crop without plowing up the old crop

b. to allow a crop that requires flooded fields to be grown on a slope

c. to provide a windbreak and avoid erosion by wind

d. to allow for crop rotation so that friends do not become depleted of minerals

What is the purpose of the farming technique shown here a to enable farmers to plant a new crop without plowing up the old crop b to allow a crop that requires class=