National unions differed from local unions in that national unions
a)included workers from different industries.
b)did not support the eight-hour work day.
c)refused to use strikes as a way to achieve their goals.
d)excluded craft union members and skilled workers.
Generally speaking, national unions differed from local unions in that national unions "a)included workers from different industries", since they were able to negotiate with "larger" terms than the local, more specialized unions.
