Answer : 1. "2500 to 1500 BCE"
Explanation :

The Harappan civilization, also known as the Indus Valley civilization, flourished around 3300 to 1300 BCE. It was one of the world's earliest urban civilizations, and its remains have been discovered in the modern-day countries of India and Pakistan, as well as Afghanistan and Iran. The civilization was named after the ancient city of Harappa, one of its major centers.