The correct answer is (a) Arjun Sengupta.
Arjun Sengupta is an Indian economist and social scientist. He was the Chairman of the National Commission for Enterprises in the Unorganised Sector from 2005 to 2009. He is also a former member of the Planning Commission of India and the Indian Statistical Institute.
K. Chandra Shekhar Rao is the Chief Minister of Telangana. He is the founder and president of the Telangana Rashtra Samithi.
P. R. Das Munshi was an Indian politician and freedom fighter. He was the Governor of Uttar Pradesh from 1952 to 1957.
K. Natwar Singh is an Indian politician and diplomat. He was the Minister of External Affairs of India from 1991 to 1996.
Arjun Sengupta is the most qualified person to be the Chairman of the National Commission for Enterprises in the Unorganised Sector. He has a wealth of experience in the field of economics and social science. He is also well-versed in the issues faced by the unorganised sector.