A Major Cause in the Decline of Union Membership in the United

A major cause in the decline of union membership in the United States was a(n)

A) shift in the nation's economic life toward industrial production.
B) decline in public support for unions.
C) shift in the nation's economic life away from service delivery.
D) increase in the number of union members with purposive incentives.
E) increase in the number of union members with concurrent incentives.