What is the land like in the south and southwest parts of asia

Dry and very hot.

Explanation:

South and south-west part of Asia is the largest land area of the world where a lot of population lives. The region of Southwest Asia leans to be dry and very hot. the region of Southwest Asia has a desiccated or water less climate, which makes that the region's freshwater is often very less or available which is not consumable. Most of the region gets less than 18 inches of precipitation in a year.

a is the answer i believe.