The United Association of Plumbers and Pipefitters is a labor union that seeks to unite plumbers and pipefitters from around the country. The members of this union exhibit the same set of skills and are proficient in relatively similar tasks. Such an association is most likely an example of a(n)

A) craft union.
B) industrial union.
C) local union
D) business union.
E) vertical union.

A craft union is a type of labor union that brings together workers who possess similar skills or perform the same type of work, such as plumbers and pipefitters. This differs from an industrial union, which includes workers from a variety of industries, and a local union, which represents workers within a specific geographic area. A business union is a union that focuses on economic and financial issues rather than specific occupational concerns. A vertical union is not a recognized type of union.