The correct option is A Anusilan Samiti
The Alipore Bomb Case was the trial of a number of revolutionaries of the Anushilan Samiti in Calcutta under charges of waging war against the Government. Among the famous accused were Aurobindo Ghosh, his brother Barin Ghosh as well as 37 other Bengali nationalists of the Anushilan Samiti. Sri Aurobindo was acquitted of all charges while some were given varying terms of imprisonment or transportation, etc