4. Most employees in the computer industry move from company to company, changing jobs several times in their careers. However, Summit Computers is known throughout the industry for retaining its employees. Summit credits its success in retaining employees to its informal, nonhierarchical work environment.

Which of the following, if true, most strongly supports Summit’s explanation of its success in retaining employees?

(A) Some people employed in the computer industry change jobs if they become bored with their current projects.

(B) A hierarchical work environment hinders the cooperative exchange of ideas that computer industry employees consider necessary for their work.

(C) Many of Summit’s senior employees had previously worked at only one other computer company.

(D) In a nonhierarchical work environment, people avoid behavior that might threaten group harmony and thus avoid discussing with their colleagues any dissatisfaction they might have with their jobs.（B）

(E) The cost of living near Summit is relatively low compared to areas in which some other computer companies are located.

请问D错在哪里？谢谢！

 D说在不分等级的工作环境中，人们避免了威胁组织融洽的行为因此避免了同事之间对于工作不满的讨论（这个暗含的意思工作不满，只是没说出来）不能支持原文的结论，因为没有说在不分等级的工作环境中，员工如何不跳槽。

B说了hierarchical work environment在计算机行业中对雇员的坏处。（因此没有它，雇员就会满意度上升）