The map shows ancient and modern cities on the Indian subcontinent. A map titled Ancient and Modern Cities on the Indian Subcontinent. A key shows Ancient Indian civilizations with yellow dots and Modern Indian cities with purple dots. There are groups of yellow dots near the western coast and along the Indus River. The modern Indian cities of Mumbai and Chennai are along the coastline with Kolkata and New Delhi near rivers.

How do the locations of ancient and modern Indian cities differ?

a Ancient cities developed only in inland regions, while modern cities developed along the coast.

b Ancient cities developed in mountains, while modern cities developed along the Ganges River.

c Ancient cities developed along the Arabian Sea, while modern cities developed mainly on the Bay of Bengal.

d Ancient cities developed mainly along the Indus River, while modern cities developed near different bodies of water.