Step 1: Define money supply components.
- M3 (A): Broadest measure; includes public currency, bank demand deposits, and RBI other deposits. Matches (I).
- M2 (B): Includes public currency, bank demand deposits, RBI other deposits, and bank net time deposits. Corresponds to (II).
- M1 (C): Includes public currency, demand deposits, RBI other deposits, and post office savings bank savings deposits. Corresponds to (III).
- M4 (D): Includes all M3 and M1 components, plus total post office savings organization deposits (excluding National Savings Certificates). Corresponds to (IV).
Step 2: State the conclusion.
The correct matching is (A) - (I), (B) - (II), (C) - (III), (D) - (IV).