Where do the majority of people live in south asia

They mostly live in the fertile river plains between the cordilleras

The realm was the birthplace of two of the world’s great religions, Hinduism and Buddhism, but there are also immense Muslim populations and large groups of followers of various other religions as well. Hinduism, Islam, and Buddhism are the top three religions of South Asia. While Pakistan and Iran are both Islamic republics, each represents a significant branch of that faith; Iran is predominantly Shia, and Pakistan is mostly Sunni. Religious differences are also evident on the eastern border of the realm, where Bangladesh and India share a border with Myanmar. Bangladesh is mainly a Muslim country, while most in India align themselves with Hinduism. In Myanmar, most follow Buddhist traditions. In addition, Sikhism is a major religion in the Punjab region, which is located on India’s northern border with Pakistan.

Aor b but i'm going with b