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The correct answer is option 3, Sunil Khilnani. Sunil Khilnani is the author of the book `The Idea of India`.
Option 1: Khushwant Singh is a renowned Indian author and journalist, but he is not the author of `The Idea of India`.
Option 2: Shashi Tharoor is a well-known Indian politician and author, but he is not the author of `The Idea of India`.
Option 3: Sunil Khilnani is an Indian author and academic. He is known for his works on Indian politics and history. He authored the book `The Idea of India`, which explores the concept of India as a nation and the diverse identities within it.
Option 4: William Dalrymple is a popular British historian and author. While he has written extensively on Indian history and culture, he is not the author of `The Idea of India`.
Therefore, the correct answer is option 3, Sunil Khilnani.