The institution primarily responsible for planning and economic development at the national level in India:

Ministry of Finance
Reserve Bank of India
NITI Aayog
Planning Commission of India

The correct answer is C) NITI Aayog.

NITI Aayog (National Institution for Transforming India) is a policy think tank of the Government of India, established on 1 January 2015 by the prime minister Narendra Modi, in pursuance of the recommendations of the 14th Finance Commission. The institution replaced the Planning Commission of India.

NITI Aayog is headed by the prime minister and has a vice-chairman, four full-time members, and a number of part-time members. The institution is also assisted by a number of advisors and experts.

NITI Aayog’s mandate is to provide strategic and policy inputs to the central government, state governments, and other stakeholders, and to foster cooperative federalism. The institution is also responsible for monitoring the implementation of national development programmes and schemes.

NITI Aayog has been working on a number of initiatives, including the preparation of a national infrastructure plan, the development of a national urban policy, and the promotion of innovation and entrepreneurship.

The other options are incorrect.

A) Ministry of Finance is the ministry of the Government of India responsible for the formulation and implementation of the country’s economic policies. The ministry is headed by the finance minister, who is a member of the Union Cabinet.

B) Reserve Bank of India is the central bank of India. The bank was established in 1935 under the Reserve Bank of India Act, 1934. The bank is responsible for the formulation and implementation of monetary policy, the regulation of the financial system, and the management of the country’s foreign exchange reserves.

D) Planning Commission of India was a government planning body of India. The commission was established in 1950 by the Planning Commission Act, 1950. The commission was responsible for the formulation and implementation of the country’s five-year plans. The commission was dissolved in 2015 and replaced by NITI Aayog.