The correct answer is NITI Aayog.
The Planning Commission of India was an economic planning body established in 1950. It was replaced by the National Institution for Transforming India (NITI Aayog) in 2015. The NITI Aayog is a policy think tank that provides strategic and policy advice to the Government of India. It is headed by the Prime Minister of India and has a Governing Council that includes the Chief Ministers of all states and the Lieutenant Governors of all Union Territories.
The Finance Commission is a constitutional body that is responsible for recommending the sharing of central taxes between the central government and the state governments. It is also responsible for recommending the grants-in-aid to the states. The RBI is the central bank of India. It is responsible for formulating and implementing monetary policy, regulating the banking system, and issuing currency. The Ministry of Finance is the ministry of the Government of India that is responsible for the formulation and implementation of economic policies.
The NITI Aayog is a better choice than the other options because it is a more modern and flexible body that is better suited to the needs of the 21st century. It is also more inclusive, as it has representation from all states and Union Territories.