The correct answer is (c), the Prime Minister.
NITI Aayog is a government body in India that was formed in 2015 to replace the Planning Commission. It is headed by the Prime Minister, who is assisted by a Vice Chairman and a number of other members. The Aayog’s primary function is to advise the government on economic and social policy.
The CEO of NITI Aayog is a non-executive position, and the Minister of Co-operatives is not a member of the Aayog. The President of India is the head of state, but does not have any executive powers.