The correct answer is Chandra Shekhar Azad.

• The failure of the first non-cooperation movement had led to the revival of the armed movement.
• In October 1924, after an All India Conference, the Hindustan Republican Association (HRA) was founded to organize an armed revolution in India. 
• Between Kakori and Alamnagar, near Lucknow, the Kakori Revolution i.e. a train robbery happened on 9 August 1925.
• The robbery was led by Ram Prasad Bismil, and they looted the British treasure from a train.
• Other revolutionaries involved were Ashfaqulla Khan, Chandrashekhar Azad, Rajendra Lahiri, Manmathnath Gupta, Sachindra Bakshi, Keshab Chakravarthy, Mukundi Lal (Mukundi Lal Gupta), Murari Sharma (fake name of Murari Lal Gupta), and Banwari Lal.
• The British Government arrested armed revolutionary youths and tried them in the Kakori (Conspiracy case - 1925). 
• Four, including Ram prasad Bismil and Ashfaqulla, were hanged, seventeen were sentenced to long terms of imprisonment and four were sentenced to life imprisonment.
• Later the revolutionaries came under the influence of socialist ideas, and in 1928 under the leadership of Chandra Shekhar Azad,  changed their organization title to the Hindustan Socialist Republican Association (HSRA).