Bhagat Singh , Chandrashekhar Azad and Rajguru shot dead a British police officer who they thought was

A. Responsible for ordering Jallianwala massacre
B.  Responsible for the murder of Lala Lajpat Rai
C. Instrumental for the introduction of public safety bill
D. Are responsible for ordering the Hanging of Ram Prasad Bismil

Right answer:- responsible for the murder of Lala Lajpat Rai