How did Samuel Gompers and the American Federation of Labor's goals differ from those of the Knights of Labor?
(A) Gompers was deeply influenced by Marxist ideas of class struggle.
(B) Gompers believed that workers should be organized as producers rather than by craft or occupation.
(C) Gompers believed that workers should focus on concrete, achievable gains and possess power sufficient to back up their cause.
(D) Gompers believed that an eight-hour day was an unattainable goal.