Option C — (A) is correct, but (R) is incorrect.
Assertion (A) is correct. However, it is the Indian law (not the World Bank) that legalises the use of rupee as a medium of payment in India. The Reserve Bank of India issues currency notes on behalf of the Central Government.
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The passage clearly states: "the law legalises the use of rupee as a medium of payment." The World Bank has no role in legalising India's currency. The RBI issues currency notes on behalf of the Central Government. Examiners expect students to identify this factual error in the Reason — the authority is Indian law/RBI/Central Government, not the World Bank.