Which of the following metal was NOT found at Harappan site?

Iron

The correct answer is Option (4) → Iron

The absence of iron at Harappan archaeological sites is an important historical and archaeological observation. It suggests that the Harappan civilization, which existed from approximately 2600 BCE to 1900 BCE, was predominantly in the Bronze Age and had not yet advanced to the widespread use of iron.

Ironworking and the Iron Age in the Indian subcontinent came later, following the decline of the Harappan civilization. Copper and bronze were the primary metals used during the Harappan period, and these metals were used to create a variety of tools, ornaments, and other artifacts.

So, the correct option is [4].