The correct option is D B.K. Dutt
Bhagat Singh and B.K. Dutt threw a bomb while shouting 'Inquilab Zindabad' in the Central Legislative Assembly on 8 April 1929 against the passage of the Public Safety Bill and the Trade Disputes Bill which would reduce the civil liberties of citizens. The aim was not to kill but to make themselves heard and use the trials to make people familiar with their movement and ideology.