Which of the Following Was NOT Identified by the Authors

Which of the following was NOT identified by the authors as a reason for the decline of unions in the United States?

A) A general lack of trust in unions by American workers and the public.
B) Workers in some larger firms are sometimes part of flexible teams that change tasks and work closely with management.
C) A decrease in union-organizing attempts.
D) A decline in traditionally unionized industries.
E) A change in the economic well-being of organizations (making it more difficult for unions to pressure for better wages and benefits) .