The correct answer is option 2, Pt. Jawaharlal Nehru. He was the first Chairman of the Planning Commission.
The Planning Commission was established in 1950 by the Government of India with the aim of promoting economic development and planning in the country. It was responsible for formulating and implementing five-year plans to guide the allocation of resources and the development of key sectors.
Dr. Rajendra Prasad, option 1, was the first President of India, but he did not serve as the Chairman of the Planning Commission.
Sardar Vallabhbhai Patel, option 3, was an Indian statesman who played a key role in the integration of British India`s princely states into the independent Union of India. He did not serve as the Chairman of the Planning Commission.
J.B. Kripalani, option 4, was a prominent Indian politician and freedom fighter, but he also did not serve as the Chairman of the Planning Commission.
In summary, Pt. Jawaharlal Nehru, option 2, was the first Chairman of the Planning Commission.