By the late 1880s, the main difference between the American Federation

By the late 1880s, the main difference between the American Federation of Labor (AFL) and the Knights of Labor was

(a) the relatively low dues charged members by their AFL locals.
(b) the broader membership base of AFL locals compared to the Knights.
(c) the AFL’s commitment to “progressive” politics.
(d) the narrow membership qualifications of AFL locals compared to
the Knights.

ANSWER

(d)