Answer:
The reason why much of South Asia’s population live on the Indo-Gangetic plain is:
C. It has fertile soils in river valleys
Explanation:
The Indo-Gangetic plain is a region in South Asia, it has presence of a big river among 70% of its territory. Allowing the soil to be rich and the river valleys to be occupied. It consists of two major river systems in the region and has seen numerous civilizations rise and expand in different eras of history. It is still a very important part nowadays.
