The correct answer is option 4. Ram Prasad Bismil, Roshan Singh, and Rajendra Lahiri were all associated with the Kakori Conspiracy case. The Kakori Conspiracy was a major incident in the Indian independence movement that occurred on 9th August 1925.

In the Kakori Conspiracy, a group of revolutionaries, including Ram Prasad Bismil, planned and executed the robbery of a train near Kakori, a small town in Uttar Pradesh, India. The robbery was carried out to fund the revolutionary activities of the Hindustan Republican Association (HRA), which was later known as the Hindustan Socialist Republican Association (HSRA).

After the robbery, the British authorities launched an extensive investigation, leading to the arrest of several revolutionaries involved in the conspiracy. Ram Prasad Bismil, Roshan Singh, and Rajendra Lahiri were among the key figures arrested and subsequently faced a trial in the Kakori Conspiracy case.

It is important to note that the options 1, 2, and 3 mentioned in the question are incorrect as these individuals were not involved in those specific activities.