Schematic diagram of the Twelfth Five-Year Plan of Ningxia Hui Autonomous Region (circle size and line thickness represent the scale of population migration).

Area I is located in the temperate continental climate zone, with dry climate and little rain, which is not suitable for the development of planting industry; A right.

Area II is short of water resources, but it can develop animal husbandry. B wrong.

There is more precipitation in Area III, so planting can be developed, but "vigorously developing planting" may aggravate soil erosion in this area; C is wrong

Area ⅳ is located in mountainous area with high latitude, and the climate is relatively cool, but there is less precipitation. Not in wet areas, forestry can be developed. D is wrong.