The correct answer is Lothal.
Key Points
Lothal:
- A massive dockyard was found in the Harappan city of Lothal. (Hence option 3 is correct.)
- Harappa port-town of Lothal is located along the Bhogava river, a tributary of Sabarmati, in the Gulf of Khambat.
- This was an important centre for making objects out of stone, shell, and metal.

Indus Civilization:
- It is also known as the Harappan Civilization.
- Time period: 2300 and 1750 BCE
- The main occupations of the people were agriculture and the domestication of animals.
- Trade was of the barter type.
- Bronze and copper vessels are outstanding examples of the Harappan metal craft.
- Town planning:
- Grid system: Roads were wide and cut each other at a right angle, houses were built in a systematic manner.
- Use of burnt bricks
- Every house had its own courtyard and bathroom.
- Underground drainage system (connecting all houses to the street drains)
Additional Information
| Site | Location | Excavated by | Important Findings |
| Harappa | Pakistan (Bank of Ravi) | Daya Ram Sahni in 1921 | Sandstone statues of Human anatomy, Granaries, and Bullock carts |
| Mohenjodaro | Pakistan (Bank of Indus) | R.D Banerjee in 1922 | Great bath, Granary, Bronze dancing girl, Seal of Pashupati Mahadeva, Steatite statue of beard man and A piece of woven cotton |
| Lothal | Gujarat on Bhogva river near Gulf of Khambhat | S.R.Rao in 1954 | First manmade port, Dockyard, Rice husk, Fire altars, and Chessboard |
| Kalibangan | Rajasthan on the bank of Ghaggar river | Amalanand Ghose in 1953 | Fire altar, Camel bones, and Earliest plowed field |
| Dholavira | Gujarat in Rann of Kachchh | J. P. Joshi in 1967-68 | Water harnessing system and Water reservoir |
| Rakhigarhi (largest) |
Hisar district of Haryana |
Amarendra Nath | Animal sacrificial pit, Triangular and circular fire altars, Toy cart frame, and wheel of terracotta |