Why did the Indo-Aryans stop living as nomads and begin settling down in village

The Indo-Aryan Migration (1800-1500 BCE)

Foreigners from the north are believed to have migrated to India and settled in the Indus Valley and Ganges Plain from 1800-1500 BCE. The most prominent of these groups spoke Indo-European languages and were called Aryans, or “noble people” in the Sanskrit language. These Indo-Aryans were a branch of the Indo-Iranians, who originated in present-day northern Afghanistan. By 1500 BCE, the Indo-Aryans had created small herding and agricultural communities across northern India.

These migrations took place over several centuries and likely did not involve an invasion, as hypothesized by British archaeologist Mortimer Wheeler in the mid-1940s. Wheeler, who was Director General of the Archaeological Survey of India from 1944 to 1948, suggested that a nomadic, Indo-European tribe, called the Aryans, suddenly overwhelmed and conquered the Indus River Valley. He based his conclusions on the remains of unburied corpses found in the top levels of the archaeological site of Mohenjo-daro, one of the great cities of the Indus Valley Civilization, whom he said were victims of war. Yet shortly after Wheeler proposed his theory, other scholars dismissed it by explaining that the skeletons were not those of victims of invasion massacres, but rather the remains of hasty burials. Wheeler himself eventually admitted that the theory could not be proven.

the answer would be a)henry grady because he came up with the term "new south"