Explanation: This question asks about the Indian port that handles the most import cargo.

Option 1 - Calcutta: While Calcutta (Kolkata) port is one of India`s oldest and busiest ports, it doesn`t top in terms of handling the highest tonnage of import cargo.

Option 2 - Kandla: Kandla port (also known as Deendayal port) in Gujarat is one of the busiest ports in terms of volume, but its focus is more on export cargo, particularly agricultural commodities, rather than import.

Option 3 - Mumbai: Mumbai port, also a major port of India, does handle a significant amount of import and export cargo but it does not handle the highest tonnage of import cargo.

Option 4 - Visakhapatnam: The correct answer is Vishakhapatnam. As the oldest shipyard in India, Visakhapatnam (also known as Vizag) port in Andhra Pradesh is the largest in terms of capacity and handles a variety of cargo including crude oil, steel, coal, and ores, thus handling the highest tonnage of import cargo.