Option C
Membership in the Knights of Labor was: open to all working people, including employers.
Explanation:
The Knights of Labor was a particularly growing team and the primary leading national labor party in the United States. Most of the utmost earlier associations restrained membership to proficient workers those with specific practice in a craft and white fellows. It dawned as a covert group proposed to defend its members from employer retaliations.
Emigrants, African Americans, and gentlewomen were also esteemed as members. the Knights of Labor gained patron amidst coal excavators in Pennsylvania, and with railroad operators By 1886, the Knights pretended more than 700,000 members everywhere.