Detailed Solution:
The correct answer is “Arikamedu”.
Arikamedu, located near modern-day Pondicherry (Puducherry) in southern India, was an ancient port city that served as an important trading center. Excavations at Arikamedu have revealed Roman artifacts such as Roman pottery, beads, lamps, and coins, indicating significant trade relations between India and the Roman Empire during that period.
Therefore, option (4) is correct.