The correct answer is C. An Era of Darkness.
Shashi Tharoor is an Indian politician, diplomat, author, and former United Nations Under-Secretary-General. He has written several books, including:
- An Era of Darkness: The British Empire in India (2017)
- India Shastra: Glimpses of Indian History (2016)
- Pax Indica: India and the World in the 21st Century (2012)
- Beyond the Looking Glass: Essays in Indian History and Politics (2009)
- Nehru: The Invention of India (2003)
A. It's Not About You is a book by American author Gary Vaynerchuk. B. Invisible People is a book by American author Mark Sundeen. D. Democrats and Dissenters is a book by American author Michael Kazin.