Step 1: Understanding the copper sources in the Indus civilization.
The Indus Valley Civilization, known for its advanced urban planning, traded with several regions for various materials, including copper. The copper used in the civilization was largely obtained from Rajasthan, a region known for its rich mineral deposits, especially in places like Khetri.
Step 2: Analyzing the options.
(A) Rajasthan: Correct. Rajasthan, particularly the Khetri region, was known for its copper mines and provided copper to the Indus civilization.
(B) Bihar: This is incorrect. While Bihar is an important historical region, it was not known for copper production during the Indus period.
(C) Afghanistan: This is incorrect. Afghanistan was known for other resources, but not for providing copper to the Indus civilization.
(D) Iran: This is incorrect. Iran was known for other materials but did not serve as the primary source of copper for the Indus civilization.
Step 3: Conclusion.
Copper was primarily obtained from Rajasthan in the Indus civilization. Therefore, the correct answer is (A) Rajasthan.