Correct Answer: (b) Dr. Rajendra Prasad
Solution:There were two flag committees mentioned in Indian history-(1) The Flag Committee was constituted on 2 April, 1931 at Karachi Session under the chairmanship of Sardar Vallabhbhai Patel. (2) An Ad-hoc Committee on National Flag was formed on 23 June, 1947 whose chairman was Dr. Rajendra Prasad. As the question is about chairman of the Flag Committee constituted by the Constituent Assembly, so the correct answer is option (b). J.B. Kripalani was neither chairman nor a member of any of the Flay Committees.