The correct answer is option 3, Bhagwati Charan Vohra. Sukhdev, Chandrashekhar Azad, and Bhagat Singh were all prominent figures in the Indian independence movement, but they did not write "The Philosophy of the Bomb."

Bhagwati Charan Vohra was a revolutionary and a close associate of Bhagat Singh. He was a prolific writer and thinker who contributed to the revolutionary literature of the time. "The Philosophy of the Bomb" is one of his notable works.

It is important to note that Bhagwati Charan Vohra`s writings and ideas reflected a certain ideological perspective and were influenced by the revolutionary fervor of the time. "The Philosophy of the Bomb" discusses the rationale and philosophy behind the use of violent means to attain independence and challenge the oppressive British colonial rule in India.

In summary, option 3, Bhagwati Charan Vohra, is the correct answer as he is the author of "The Philosophy of the Bomb."