Violence Erupted During the Homestead Strike When

Violence erupted during the Homestead strike when

A) Andrew Carnegie announced his plans to sell the plant to J. P. Morgan.
B) chief executive Henry Frick tried to break the strike by bringing in Pinkerton agents.
C) police attempted to break up a secret protest meeting organized by homesteaders.
D) it became clear that Carnegie's profits had been slashed in half and he was close to bankruptcy.
E) Andrew Carnegie fired chief executive Henry Frick, who was sympathetic to the organizers.