Detailed Solution:
The correct answer is “Rabindra Nath Tagore”.
The person who returned his token of Honour to the British Government (not the Government of India, as India was not independent at that time) on May 30, 1919 was: (4) Rabindra Nath Tagore.
He returned his knighthood, a British honor, in protest of the Jallianwala Bagh Massacre.