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.
9. 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
ever 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) 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.
答案是D, 但是我怎么觉得E是对的。。E说作者假设在new plant里,除了被雇佣的人外,还有没被雇佣的人有history of union affiliation, 这样就能得出作者的结论--new plant对有history of union affiliation的人有歧视。而D选项说的cost是歧视的原因,感觉好像可能对也可能不对,不能当成假设吧? 求大神指点啊~~~谢谢了