Explanation:

3rd option is correct.
The First President of Ghadar Party was Sohan Singh Bhakna.
Baba Sohan Singh Bhakna (1870–1968) was an Indian revolutionary, the founding president of the Ghadar Party, and a leading member of the party involved in the Ghadar Conspiracy of 1915. Tried at the Lahore Conspiracy trial, Sohan Singh served sixteen years of a life sentence for his part in the conspiracy before he was released in 1930. He later worked closely with the Indian labour movement, devoting considerable time to the Kisan Sabha and the Communist Party of India.