Who renounced the knighthood in protest of Jallian Wallah Bagh?

Who renounced the knighthood conferred on him in protest of Jallian Wallah Bagh?
     a) Rabindranath Tagore
     b) Devendranath Tagore
     c) Eswar Chandra vidya Sagar
     d) Veeresalingam Pantulu

Ans: ( a )