The correct option is B Lahore Conspiracy
Lala Lajpat Rai died due to lathi charge while leading the anti-Simon Commission demonstration on 30 October 1928. To avenge his death, Bhagat Singh, Raj guru, Jai Gopal and Sukh Dev conspired to kill the police chief, Scott but instead killed the DSP – J. P. Saunders. Later Bhagat Singh was trialed and sentenced to death in this Lahore Conspiracy Case when he was captured after throwing bomb in Delhi Assembly.