Explanation:

- BR Ambedkar (Option 1): He was the Chairman of the Drafting Committee of the Constituent Assembly of India. He played a crucial role in shaping the Indian Constitution.

- Jawaharlal Nehru (Option 2): He was a prominent leader in the independence movement and later became the first Prime Minister of India. He was not the chairman of the Drafting Committee.

- Sardar Vallabhbhai Patel (Option 3): Known for his efforts in unifying India, he was an important member of the Constituent Assembly but did not hold the position of chairman for its Drafting Committee.

- Rajendra Prasad (Option 4): He was the President of the Constituent Assembly and later became the first President of India. However, he was not the Chairman of the Drafting Committee.

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