The correct answer is option 2 and here is the explanation based on the provided list:
A. Anil Kakodar is matched with 4. Chairman, Atomic Energy Commission. Anil Kakodar is a veteran Indian nuclear scientist and mechanical engineer. He was the chairman of the Atomic Energy Commission of India.
B. Raman Puri is matched with 2. Chief of the Integrated Defence Staff. Raman Puri is a former Indian Army officer, who served as the Chief of Integrated Defence Staff.
C. M. Jagannatha Rao is matched with 1. Chairman, 17th Law Commission. M. Jagannatha Rao is a former Judge of the Supreme Court of India, who served as the chairman of the 17th Law Commission of India.
D. G. Madhavan Nair is matched with 3. Chairman, ISRO. G. Madhavan Nair has been an Indian space scientist and a former chairman of the Indian Space Research Organisation (ISRO).
Hence, going through the positions and persons` correct match, it validates the correct answer being Option 2.