Step 1: Understanding the Concept:
The question asks for the location of the headquarters of the Reserve Bank of India (RBI), which is India's central bank.
Step 2: Detailed Explanation:
The Reserve Bank of India was established on April 1, 1935. Its central office was initially established in Calcutta (now Kolkata) but was permanently moved to Mumbai in 1937. The RBI Governor's office is located here, and major policy decisions are formulated in the Mumbai headquarters.
Step 3: Final Answer:
The headquarters of the Reserve Bank of India is in Mumbai. Therefore, option (B) is the correct answer.