Explanation:

- Option 1: Amitav Ghosh

This is the correct answer. Amitav Ghosh is a well-known Indian author who wrote "Sea of Poppies," the first book in the Ibis Trilogy. The novel is set against the backdrop of the opium trade in the 19th century.

- Option 2: Shashi Tharoor

Shashi Tharoor is an Indian politician and author. He has written several books, including "Inglorious Empire" and "The Great Indian Novel," but not "Sea of Poppies."

- Option 3: Manohar Malgonkar

Malgonkar was an Indian author known for novels like "The Princes" and "A Bend in the Ganges." He did not write "Sea of Poppies."

- Option 4: Anuj Dhar

Anuj Dhar is best known for his work on historical and political topics, primarily concerning Subhas Chandra Bose. He did not author "Sea of Poppies."