Which of the following can at least partially explain the decline in union density rates in the United States since the 1960's?

A) Employment in traditionally unionized industries such as manufacturing has decreased.
B) Employment in service and knowledge industries has declined.
C) Employment growth in the north has been faster than employment growth in the south.
D) Educated workers are more likely to unionize than uneducated workers.

Union Density Rates

The percentage of workers who are union members in a specific area or sector, indicating the level of union membership and influence.

Traditionally Unionized

Refers to sectors or industries that have historically had a strong union presence and high membership rates.

Manufacturing

The process of turning raw materials or components into finished goods through the use of tools, human labor, machinery, and chemical processing.