Ancient history

What metals was not known to the Indus Valley people 1 Tin 2 Lead 3 Iron 4 Copper?

The correct answer is 1. Tin. The Indus Valley Civilization flourished between 2500 BCE and 1900 BCE in the basins of the Indus River wherefore the civilization derives its name. The people of the Indus Valley used a variety of metals, including copper, bronze, gold, silver, and lead. However, they did not use tin.