Explanation:
• Gold ✅ – Used for making beads, armlets, needles, and ornaments. Likely sourced from Himalayan rivers and South India.
• Silver ✅ – Widely used, even more than gold, for ornaments and dishes; possibly imported from Mesopotamia.
• Copper ✅ – Used for making tools and weapons (axes, chisels, knives, etc.); obtained mainly from Khetri in Rajasthan.
• Iron ❌ – Not known to the Harappans, as the civilization existed during the Bronze Age, before the widespread use of iron.
• Thus, only three metals (gold, silver, and copper) were used by the Harappans.
Answer: (C) Only three