Rabindranath Tagore renounced his knighthood in response to the Jallianwalla Bagh incident. Option 1 is the correct answer.

Rabindranath Tagore was a prominent Bengali poet, writer, and philosopher who was awarded the title of knighthood by the British government in 1915 for his literature and contributions to Indian culture. However, the Jallianwalla Bagh incident, which took place on April 13, 1919, deeply shook Tagore and led to his decision to renounce his knighthood.

The Jallianwalla Bagh massacre was a tragic event where British troops opened fire on a crowd of peaceful protestors in Amritsar, Punjab, resulting in hundreds of deaths and injuries. This brutal act of violence by the British authorities outraged Tagore and many others in India.

Renouncing his knighthood was Tagore`s way of expressing his strong disapproval and condemnation of the British government`s actions. It was a symbolic act to protest against the injustice and brutality of colonial rule. By renouncing his knighthood, Tagore stood in solidarity with the Indian people and their struggle for freedom and independence.