What Economic Change Has Made It More Difficult for Workers

What economic change has made it more difficult for workers to strike effectively?

A) the increasing availability of communications technology
B) a strong, organized working class in the United States
C) the ease with which manufacturing firms can move operations to another country
D) the increased levels of agricultural production that have come about as a result of new technologies and better animal breeding techniques
E) the increasing role played by nonprofits and Third Sector organizations