What is the common element among Ram Prasad Bismil, Roshan Singh and R

What is the common element among Ram Prasad Bismil, Roshan Singh and Rajendra Lahiri ?

They threw a bomb in the Central Legislative Assembly on 8 April, 1929
They were the founder members of Swaraj Party
They were the founders of Hindustan Republican Association
They were associated with Kakori Conspiracy case
This question was previously asked in
UPSC NDA-1 – 2015
Ram Prasad Bismil, Roshan Singh, and Rajendra Lahiri were all prominent revolutionaries associated with the Hindustan Republican Association (HRA). Their common and most significant link is their involvement in the Kakori Conspiracy Case of 1925. They participated in the train robbery at Kakori, which was planned to fund the HRA’s revolutionary activities. Along with Ashfaqulla Khan, these three were arrested, tried, and subsequently sentenced to death and executed by the British government for their role in the conspiracy.
The Kakori Conspiracy (August 9, 1925) was a defining event for the Hindustan Republican Association (HRA) and highlighted the commitment of its members to armed revolution. The trial and execution of key leaders like Bismil, Ashfaqulla Khan, Lahiri, and Roshan Singh created martyrs for the independence movement.
While Ram Prasad Bismil was a leading figure in the HRA and one of its early organizers, the statement that they were the ‘founders’ of HRA (Option C) is not as precise as their shared involvement and fate in the Kakori Conspiracy case. The HRA was founded earlier in 1924 by individuals like Sachindra Nath Sanyal, Narendra Mohan Sen, and Pratul Ganguly, with Bismil being a prominent leader within the organization.