Explanation:

- Bhagat Singh: Bhagat Singh was a prominent freedom fighter known for his revolutionary activities against British rule. He wrote the essay "Why I am an Atheist" to articulate his rejection of religious orthodoxy and defend his atheism.

- Ras Behari Bose: He was a key figure in the Indian Nationalist Movement and contributed significantly to the struggle against British colonialism. However, he did not write the autobiography in question.

- Ram Prasad Bismil: Another major revolutionary, Bismil was involved in several anti-British movements. He wrote many poems and authored works like his autobiography, but not "Why I am an Atheist."

- Aurobindo Ghosh: A philosopher and nationalist, Aurobindo's works primarily include philosophical writings and spiritual teachings, rather than this essay.