Concept:
The Constituent Assembly appointed several committees to deal with different tasks of constitution-making. These committees were headed by the most prominent leaders of the national movement.
Step 1: Matching Nehru and Patel's Committees.
• A. Union Powers Committee (Jawaharlal Nehru): Nehru headed committees related to central authority and foreign affairs, including the Union Constitution Committee. (A-III)
• B. Provincial Constitution Committee (Sardar Patel): Patel was responsible for committees dealing with the states (provinces) and fundamental rights/minorities. (B-I)
Step 2: Matching Ambedkar and Prasad's Committees.
• C. Drafting Committee (B.R. Ambedkar): This was the most important committee, tasked with preparing the actual text of the Constitution. Ambedkar is known as its architect. (C-II)
• D. Steering Committee (Rajendra Prasad): As the President of the Constituent Assembly, Dr. Prasad headed the committee that managed the assembly's business and procedures. (D-IV)
Step 3: Final Sequence.
The alignment A-III, B-I, C-II, D-IV corresponds to Option (4).