Which reason best explains why areas of South Asia with arid climates arent densly populated?

Question

The arid climates contributed to low air quality from pollution

Cites located in arid climates are negatively affected by floods from nearby rivers

The arid climates cannot support farming

Answer 1

The reason that best explains why areas of South Asia with arid climates aren't densely populated is:

The arid climates cannot support farming.

Arid regions typically have limited water resources and less fertile soil, which makes agriculture difficult. Since farming is a primary source of sustenance and economic activity in many regions, a lack of agricultural viability leads to lower population densities.