Concept:The Harappan Civilization is a Bronze Age civilization that used bronze tools and weapons. Iron was not known to them.Explanation:The Harappans lived from 2500 to 1700 BCE. They made tools, utensils, and ornaments from bronze (an alloy of copper and tin). This places them in the Bronze Age. The Iron Age came later (1200–600 BCE) and the Copper Age was a transitional period before bronze use. The Harappans did not use iron or brass.Answer:A. Bronze Age