What was the first site of Indus Valley Civilisation that was discovered?

Harappa

The correct answer is Option (4) → Harappa

Harappa was the first site of the Indus Valley Civilisation that was discovered.

Although Harappa was the first site to be discovered, it was badly destroyed by brick robbers. As early as 1875, Alexander Cunningham, the first Director-General of the Archaeological Survey of India (ASI), often called the father of Indian archaeology, noted that the amount of brick taken from the ancient site was enough to lay bricks for “about 100 miles” of the railway line between Lahore and Multan.