The correct answer is: A. Kerala
Ex-President Pranab Mukherjee inaugurated the 77th Session of the Indian History Congress in Thiruvananthapuram, Kerala on 12 December 2017. The theme of the conference was “Rethinking Indian History: Challenges and Opportunities”.
The Indian History Congress is a professional organization of historians in India. It was founded in 1938 and has been holding annual conferences since then. The conference provides a forum for historians to present their research and discuss the latest trends in historical scholarship.
The 77th Session of the Indian History Congress was attended by over 1,000 historians from India and abroad. The conference featured keynote addresses by eminent historians, panel discussions, and paper presentations.
The conference was a great success and provided a valuable opportunity for historians to share their research and ideas. It also helped to promote the study of history in India.
The other options are incorrect because they are not the state in which Ex President Pranab Mukherjee inaugurated the 77th Session of the Indian History Congress.