Which of the Following Is Not a Reason Employers Have

Which of the following is not a reason employers have begun to replace strikers with permanent replacements during an economic strike?

A) Mergers, downsizing, and companies going out of business provided trained workers.
B) High unemployment caused workers to cross picket lines.
C) The only effective weapon a company has against a strike is to keep operating.
D) Companies hope to prevent being a target of a rolling strike.