The correct answer is option 3 i.e. Kamagata Maru incident.
A ship named Komagatamaru , filled with Indian immigrants was turned back from Canada. As the ship returned to India several of its passengers werekilled or arrested in a clash with the British police.
This incident led the Ghadar Party to declare war against British imperialism.
Original name of the Ghadar Party was Pacific Coast Hindustan Association
The founding president of Ghadar Party was Sohan Singh Bhakna and Lala Hardayal was the co-founder of this party
Headquarters of the movement were set up at Yugantar Ashram in San Francisco in 1913.
However, the objectives of the movement were not fully comprehended or achieved simply due to a disorganized leadership.