The correct answer is: B. Rajiv Kumar.
Rajiv Kumar is an Indian economist and civil servant who is the current Vice-Chairman of the National Institution for Transforming India (NITI Aayog). He has previously served as the Chief Economic Advisor to the Government of India and as the Governor of the Reserve Bank of India.
Ajit Tyagi is a retired Indian Administrative Service officer who served as the Chairman of the Telecom Regulatory Authority of India (TRAI) from 2012 to 2015. He has also served as the Secretary of the Department of Telecommunications and the Department of Electronics and Information Technology.
Amitabh Kant is an Indian economist and business executive who is the current CEO of the NITI Aayog. He has previously served as the Secretary of the Department of Industrial Policy and Promotion and as the Chief Executive Officer of the Confederation of Indian Industry.
Narendra Modi is an Indian politician who is the 14th and current Prime Minister of India. He was the Chief Minister of Gujarat from 2001 to 2014 and is the leader of the Bharatiya Janata Party (BJP).