Who renounced his Knighthood against the Jallianwala Bagh atrocity?

Rabindranath Tagore

The correct answer is Option 4- Rabindranath Tagore.

Rabindranath Tagore was a Bengali poet, writer, playwright, composer, philosopher, and painter who reshaped Bengali literature and music, as well as Indian art with Contextual Modernism in the late 19th and early 20th centuries. Author of Gitanjali and its "profoundly sensitive, fresh and beautiful verse", he became in 1913 the first non-European to win the Nobel Prize in Literature.

Tagore renounced his knighthood in 1919 in protest against the Jallianwala Bagh massacre, in which British troops killed hundreds of unarmed Indian civilians. He wrote in a letter to the Viceroy of India, Lord Chelmsford, that he could not "retain this honour in the face of the indignities and insults which my fellow countrymen suffer from the hands of the British Government in this country."

Tagore's renunciation of his knighthood was a powerful act of defiance against British rule in India. It inspired many other Indians to join the freedom struggle, and it helped to galvanize the Indian independence movement.