how have waterway most influenced human settlement in South Asia

a Most people live along the coasts of the Arabian Sea and the Indian Ocean to better conduct trade

b Mountains passes carved by rivers have encourage growth of cities in the northern plains

c the flood plains around the Ganges and the Brahmaputra Rivers support agriculture needed to sustain large populations

d Isolated waterways led to the growth of major cities to cut off much of the interior from settlement

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Why did most early civilizations grow up along the Nile, Tigris, Euphrates, and Indus?