The correct answer is Option 4- Rabindranath Tagore

The Indian personality who was given knighthood by the British monarch but returned it after the Jallianwala massacre was Rabindranath Tagore.

Tagore was a Bengali polymath 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 was knighted by King George V in 1915 for his contributions to literature. However, in 1919, he returned his knighthood in protest against the Jallianwala Bagh massacre, in which British troops fired on a peaceful gathering of unarmed Indians, killing hundreds of people.

Tagore's return of his knighthood was a powerful act of defiance against the British colonial regime. It was also a symbolic gesture of solidarity with the Indian people in their struggle for independence.