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

The correct option is A

Unions in the United States are organizations that represent workers in many industries recognized by US labor law. Its activity today focuses on collective bargaining on wages, benefits and working conditions for its members and on the representation of its members in disputes with the administration over violations of contractual provisions. The larger unions also often participate in lobbying and campaigning activities at the state and federal levels.

cd's

explanation:

goof d geieuiuhfwehguwrhgu8uooiihvurg[