A
The world's oldest known artificial dockyard
B
The largest underground cave temple complex
C
The highest altitude citadel discovered to date
D
The primary iron smelting furnace site
Correct answer: (a) The world's oldest known artificial dockyard
Explanation
Key A is correct as Lothal features the world's oldest known artificial dockyard from the Indus Valley Civilisation. The other options are historically inaccurate for Lothal.
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