Which of the following is an assumption on which the economists argument depends?

　　 None of the people with a history of union affiliation who were hired to work at the new plant were union organizers.

　　 Applicants for jobs at the new plant were not asked by Kreggs recruiters whether they had ever belonged to a labor union.

　　 In the plants of some of Kreggs competitors, the workforce consists predominantly of union members.

　　 The company believes that the cost of running the new plant will be lower if labor unions are not represented in the workforce.

　　 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.

　　12. Hastings contracture is a disorder of the connective tissue in one or both hands, most commonly causing loss of mobility. A survey of thousands of medical-insurance claims found that over 30 percent of people who had one hand operated on for Hastings contracture underwent surgery a second time for this disorder within three years. Clearly, therefore, a single surgical treatment of Hastings contracture is often ineffective at providing long-term correction of the disorder.

　　Which of the following, if true, most seriously weakens the argument?

　　 The medical-insurance claims did not specie whether the surgery was on the patients right or left hand.

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