With reference to the period of Gupta dynasty in ancient India, the towns Ghantasala, Kadura and Chaul were well known as

Ghantasala, Kadura, and Chaul were prominent maritime hubs on the eastern and western coasts of India that facilitated extensive foreign trade with Southeast Asia and the Roman Empire during the Gupta period. While Ghantasala is also home to a Buddhist stupa, option (d) is incorrect because the primary shared identity of all three towns in historical records is their role as commercial ports rather than pilgrimage sites. This question tests the core concept of the economic geography and maritime history of ancient India, specifically the identification of major trade centers.