The number one says that he is willing to "pay the price" wich can be interpreted as he was ready to do whatever it takes to complete his goals, violence included.
The number two says that he was about to invite others to join the "crusade against a grievance" wich may lead those others to interpreted his calling as if it was a call to war or a violent revolution.
The number four doesn't lead to violence directly, but the number three is much more explicit while saying that a fight that was about to happen was successfully stoped by the older passengers, making it clear that his "fight" wasn't violent. So the answer should be number three.
