The correct answer is (b), Dr. B.R. Ambedkar.
Dr. B.R. Ambedkar was the first Law Minister of India. He was a Dalit leader, jurist, economist, politician, and social reformer who played a leading role in the drafting of the Constitution of India. He was also the first Minister of Law and Justice of India.
Jawahar Lal Nehru was the first Prime Minister of India. He was a member of the Indian National Congress and a leading figure in the Indian independence movement.
Maulana Abul Kalam Azad was the first Minister of Education of India. He was a freedom fighter, scholar, and poet who played a leading role in the Indian independence movement.
T.T. Krishnamachari was the second Finance Minister of India. He was a member of the Indian National Congress and a leading figure in the Indian independence movement.