The Chairman of the Drafting Committee of the Constitution was B.R. Ambedkar. This committee was responsible for the drafting of the Indian Constitution. Out of the given options, J.B. Kripalani, Rajendra Prasad, and J.L. Nehru were all prominent leaders during the independence movement and played significant roles in shaping India`s political landscape. However, it was B.R. Ambedkar who was chosen to chair the Drafting Committee due to his expertise in law and his dedication to addressing issues of social justice. Ambedkar`s contribution in drafting the Constitution was crucial and he played a vital role in shaping the principles and fundamental rights enshrined in the Indian Constitution.