Option 1 -> (A), (D), (C), (B) = Chalcolithic → Early Historic → Harappan → Early Iron - This is incorrect chronologically.
Option 2 -> (A), (B), (D), (C) = Chalcolithic → Early Iron → Early Historic → Harappan - This is completely out of order.
Option 3 -> (B), (A), (C), (D) = Early Iron → Chalcolithic → Harappan → Early Historic - This is incorrect as it places iron age before bronze age cultures.
Option 4 -> (A), (C), (B), (D) = Chalcolithic → Harappan → Early Iron/Megalithic → Early Historic - This follows the correct archaeological sequence.
Hence, Option 4: (A), (C), (B), (D) -> The correct chronological sequence is: Chalcolithic (copper-stone age cultures, 3000-2000 BCE), followed by Harappan Civilization (Bronze Age Indus Valley Civilization, ~2600-1900 BCE), then Early Iron Age with megalithic burials (1200-600 BCE), and finally the Early Historic period (beginning ~600 BCE with rise of Mahajanapadas and use of writing) -> correct