Option a is the correct answer. During the Gupta period, the port that handled the North Indian trade was Tamralipti. Tamralipti was a port city and capital of Suhma Kingdom in ancient India, located on the coast of the Bay of Bengal. The Tamluk town in present-day Purba Medinipur, West Bengal, is generally identified as the site of Tamralipti Tamralipti was an important centre of Buddhism and Jainism as well. It had several Buddhist monasteries and an Ashokan pillar. It was also the departure point of the Buddhist missionary expedition sent by Ashoka to Sri Lanka in the 3rd century BCE. Important Tips Bhadoch is a port town in present-day Bharuch district, Gujarat, India. It is located on the mouth of the Narmada river. It was an ancient trade centre and a major port of western India. It was known as Barygaza, Barugaza, Barukaccha, etc. by different sources. It was mentioned by Ptolemy, Pliny, Periplus of the Erythraean Sea, and the Chinese pilgrim Xuanzang. It exported cotton, silk, indigo, ivory, pearls, and other commodities, and imported wine, gold, silver, and luxury goods. Cambay is a city in present-day Kheda district, Gujarat, India. It is located on the coast of the Gulf of Khambhat. It was an ancient trade centre and a major port of western India. It was known as Canbaye, Cambetha, Cambaytha, etc. by different sources. It was mentioned by Marco Polo, Ibn Battuta, Niccolò de' Conti, and the Portuguese traveller Duarte Barbosa. It exported cotton textiles, silk fabrics, brocade work, indigo dyeing, musk perfume, pearls, diamonds, and other commodities, and imported horses, metals, spices, and luxury goods. Kalyani port: It was an ancient port of the Satavahana dynasty that was situated on the western Deccan and was involved in maritime trade with West Asia and Africa