Among the American Federation of Labor's Successes Were All of the Following

Among the American Federation of Labor's successes were all of the following except

A) setting a new standard workday from ten to eight hours.
B) serving as an umbrella for the many craft unions.
C) arbitrating disputes to ensure worker solidarity rather than competition between different groups of workers.
D) becoming the leading labor organizations in the 1880s by appealing to middle class Americans as well as the working class.
E) The AFL achieved all of these successes.