The correct answer is A. Fazl Ali.
The States Reorganisation Commission was appointed in 1953 under the chairmanship of Fazl Ali, a former Chief Justice of India. The commission was tasked with reviewing the existing state boundaries in India and recommending changes to ensure that they were more in line with linguistic and cultural factors. The commission submitted its report in 1955, and many of its recommendations were implemented in the States Reorganisation Act of 1956.
The other options are incorrect. B. Kelkar was a member of the commission, but he was not the chairman. C. Mondal was a politician who was not involved in the commission. D. Zakir Husain was the President of India at the time the commission was appointed, but he was not a member of the commission.
The States Reorganisation Commission was a landmark event in the history of India. It led to the creation of new states based on linguistic and cultural factors, which helped to promote unity and harmony in the country.