Concept:The book "Caste in Indian Politics" explores how caste interacts with modern democratic politics in India.
Explanation:The author is Rajni Kothari, a renowned political scientist and founder of the Centre for the Study of Developing Societies.
His book challenges the idea that caste is only a traditional social division.
Instead, it shows how caste groups adapt and influence the political process.
The book includes case studies of caste movements and their role in elections and policy.
Other options are incorrect: R. P. Dutta was a British communist theorist, and M. K. Gandhi was a nationalist leader.
Answer:Rajni Kothari (Option A).