An economist concluded that Kregg Company deliberately discriminated against people with a history of union affiliation in hiring workers for its new plant. The economist’s evidence is that, of the 1,500 people hired to work at the new plant, only 100 had ever belonged to a labor union, whereas in Kregg Company’s older plants, a much higher proportion of workers have a history of union affiliation.
Which of the following is an assumption on which the economist’s argument depends
A．None of the people with a history of union affiliation who were hired to work at the new plant were union organizers.
B．Applicants for jobs at the new plant were not asked by Kregg’s recruiters whether they had every belonged to a labor union.
C．In the plants of some of Kregg’s competitors, the workforce consists predominantly of union members.
D．The company believes that the cost of running the new plant will be lower if labor unions are not represented in the workforce.
E．(E) The pool of potential candidates for jobs at the new plant included some people, in addition to those Kregg hired, with a history of union affiliation.