The correct answer is (b), Kakasaheb Kalelkar.
Kakasaheb Kalelkar was a social reformer, educationist, and politician from India. He was a member of the Indian National Congress and served as the first Chairman of the Backward Class Commission, also known as the Kalelkar Commission. The commission was appointed in 1953 to investigate the condition of the backward classes in India and to recommend measures for their upliftment.
Jagjiwan Ram was a politician from India who served as the Deputy Prime Minister of India from 1979 to 1980. He was a member of the Indian National Congress and the Janata Party.
B.R. Ambedkar was a social reformer, politician, and the chief architect of the Indian Constitution. He was a member of the Indian National Congress and the Republican Party of India.
None of the above is not the correct answer.