The correct answer is option 4: Kakori conspiracy case. Ashfaqulla Khan and Ramprasad Bismil were two prominent Indian freedom fighters who were executed for their involvement in the Kakori conspiracy case. The Kakori conspiracy was a revolutionary plot led by the Hindustan Republican Association (HRA) to rob a train carrying British government funds near Kakori, in present-day Uttar Pradesh, India.

The main objective of the Kakori conspiracy was to fund the revolutionary activities of the independence movement. On August 9, 1925, members of the HRA stopped the train and attempted to seize the money. However, the robbery failed, and several members of the HRA were captured, including Ashfaqulla Khan and Ramprasad Bismil.

They were later tried in court and found guilty of various charges, including robbery, dacoity, and murder. As a result, they were sentenced to death and executed by hanging. The Kakori conspiracy case played a significant role in galvanizing the Indian independence movement and further fueling the spirit of resistance against British colonial rule during the 1920s.