The correct option is Nickel.
Explanation
The Indus Valley Civilization maintained extensive long-distance trade networks with regions in West Asia, including Mesopotamia and the Arabian Peninsula. Scientific analysis of artefacts is utilized to trace the origin of raw materials and reconstruct these ancient economic exchanges.
Analysis:
- Archaeological and chemical studies indicate that the Harappans likely imported copper from Oman, located on the southeastern tip of the Arabian Peninsula.
- Chemical analyses performed on copper artefacts from Harappan sites and copper sources in Oman have revealed that both contain traces of Nickel.
- This specific chemical composition suggests a common geological origin, providing strong evidence for a trade relationship between the Indus Valley Civilization and Oman (identified as Magan in ancient texts).
Key Takeaway: The presence of Nickel traces is the distinctive chemical evidence that establishes a common origin for Harappan and Omani copper, confirming maritime trade links.