How did the Knights of Labor impact the Populist movement in the late 1800s?

The Knights of Labor organized workers and supported reforms that overlapped with the concerns of farmers’ groups, helping build support for the Populist movement. Their influence contributed to the formation of the Populist Party, so B, “The Knights of Labor were a factor in the formation of the Populist Party,” is correct. The party did not elect William Jennings Bryan in 1890; he became a presidential candidate later, in 1896.

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