Which among the following organisations was responsible for throwing a bomb at Viceroy Lord Hardinge in Delhi?

1. A

   All India Labour Association

   All India Labour Association. Option (a) claims this labour body was involved in the Delhi conspiracy case, but it focused on worker rights rather than revolutionary terrorism.

2. B

   United Patriotic Association

   United Patriotic Association. Option (b) claims this conservative body founded by Sir Syed Ahmed Khan orchestrated the attack, but it opposed the Indian National Congress politically.

3. C

   Anushilan Samiti

   Anushilan Samiti. Option (c) claims this revolutionary secret society was responsible for the Delhi-Lahore Conspiracy of 1912, where Rash Behari Bose and Basant Kumar Biswas executed the bomb attack on Lord Hardinge, making this the correct key.

4. D

   Yugantar

   Yugantar. Option (d) claims the prominent Bengal revolutionary weekly and group carried out this specific Delhi bombing, but the actual operation was spearheaded by members linked to the Dhaka Anushilan Samiti network.

Summary. Official key is (c) Anushilan Samiti. The December 1912 bomb attack on Viceroy Lord Hardinge during the capital transfer procession in Delhi was masterminded by Rash Behari Bose. Members of the Anushilan Samiti, notably Basant Kumar Biswas, executed the throwing of the bomb in Chandni Chowk. While Yugantar was another major revolutionary group of Bengal, the historical records directly implicate the Anushilan network in this conspiracy. Therefore, option (c) is the correct choice.