Correct option is D
The Kanpur Conspiracy Case of 1924 is a significant event in the history of India's revolutionary movement. Revolutionaries from across India gathered in Kanpur to discuss strategies for their fight against British colonial rule. This meeting was part of a broader effort by Indian revolutionaries to organize themselves after the setback of the Kakori Conspiracy Case. Important figures like S.A. Dange and Muzaffar Ahmad were involved in this meeting, which eventually led to their arrest and prosecution by the British government under the suspicion of being part of a communist conspiracy.