Who among the following is the author of the book ‘The Oath of the Vayuputras’?

The correct answer is Amish Tripathi.

Here is a step-by-step breakdown of the information:
1. Identify the book: The book mentioned in the question is 'The Oath of the Vayuputras'.
2. Context of the book: Released in 2013, 'The Oath of the Vayuputras' is the third and final installment of the popular Shiva Trilogy.
3. Identify the author: The Shiva Trilogy, which includes 'The Immortals of Meluha' (Book 1), 'The Secret of the Nagas' (Book 2), and 'The Oath of the Vayuputras' (Book 3), was written by the renowned Indian author Amish Tripathi.
4. Match with options: Comparing this with the given choices, the author is Amish Tripathi.