Correct Option: B

The shelter belt method of soil conservation is most effective in arid areas. A shelterbelt is a barrier of trees or shrubs. The term "field shelterbelt" is used to distinguish between rows of trees or shrubs on agricultural fields from those planted in other ways: around farmyards or livestock facilities (farmstead shelterbelts). It controls soil erosion and traps the moisture which is necessary to grow crop in such regions.