The correct option is
A Rash Behari Bose
The Delhi Conspiracy case, also known as the Delhi-Lahore Conspiracy, refers to a conspiracy in 1912 to assassinate the then Viceroy of India, Lord Hardinge, on the occasion of transferring the capital of British India from Calcutta to New Delhi. Hatched by the Indian revolutionary underground in Bengal and Punjab and headed by Rash Behari Bose, the conspiracy culminated on the attempted assassination on 23 December 1912 when a homemade bomb was thrown into the Viceroys's Howdah when the ceremonial procession moved through the Chandni Chowk suburb of Delhi. Hence, Option A is correct.
Among the rest of the options, Sachindranath Sanyal was extensively involved in the plans for the Ghadar conspiracy, and went underground after it was exposed in February 1915, Sohan Lal Pathak joined Gadhar Party in California, USA and came to Burma, Singapore and Malaya to influence Indian armies for a revolt against British army and Bhai Paramanand was a part of the Ghadar Conspiracy claiming he was accompanied by 5,000 Ghadarites. Hence, these are incorrect.