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The correct answer is option 3, Arikainedu.
Option 1, Bharukachtitha, is not the correct answer.
Option 2, Karur, is also not the correct answer. Karur is a city in Tamil Nadu, India, known for its textile industry and historical significance in terms of trade and commerce. However, it is not specifically related to India`s maritime links on the Coromandel coast.
Option 4, Anuradhapura, is not the correct answer either. Anuradhapura is a city in Sri Lanka known for its ancient ruins and Buddhist heritage. It is not directly connected to India`s maritime links on the Coromandel coast.
Therefore, the correct answer is option 3, Arikainedu. Arikainedu is an archaeological site located near Pondicherry in Tamil Nadu, India. It is famous for providing valuable information about India`s maritime links on the Coromandel coast. Excavations at Arikainedu have revealed evidence of a significant trading port that was active from the 2nd century BCE to the 2nd century CE. The site has provided insights into ancient maritime trade routes, the exchange of goods, and cultural interactions in the region.