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The correct answer is option 2 - Lothal.
Lothal is an important site of the Indus Valley Civilization. It is located in the modern-day state of Gujarat, India. Excavations at Lothal have revealed evidence of a dockyard, making it the only Indus culture site where a dockyard has been found. The presence of a dockyard suggests that Lothal was an important center for trade and maritime activities during the Indus Valley Civilization. The dockyard is well-structured and includes a basin with a connecting channel to the river. The purpose of the dockyard was to facilitate the docking of ships and the loading and unloading of goods. The presence of a dockyard at Lothal indicates the advanced engineering and technological skills of the people of the Indus Valley Civilization. It also suggests that they had a well-developed system of trade and commerce, with ships possibly being used to transport goods to distant places.