请帮我解释一下when在这个选项的用法，谢谢。OG10-200,没有讨论过

OG10-200,没有讨论过。

Outsourcing is the practice of obtaining from an independent supplier a product or service that a company has previously provided for itself. Since a company’s chief objective is to realize the highest possible year-end profits, any product or service that can be obtained from an independent supplier for less than it would cost the company to provide the product or service on its own should be outsourced.

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

(A) If a company decides to use independent suppliers for a product, it can generally exploit the vigorous competition arising among several firms that are interested in supplying that product.

(B) Successful outsourcing requires a company to provide its suppliers with information about its products and plans that can fall into the hands of its competitors and give them a business advantage.

(C) Certain tasks, such as processing a company’s payroll, are commonly outsourced, whereas others, such as handling the company’s core business, are not.

(D) For a company to provide a product or service for itself as efficiently as an independent supplier can provide it, the managers involved need to be as expert in the area of that product or service as the people in charge of that product or service at an independent supplier are.

(E) When a company decides to sue an independent supplier for a product or service, the independent supplier sometimes hires members of the company’s staff who formerly made the product or provided the service that the independent supplier now supplies.

总觉得E选项的理解有些怪，when的用法？

这句话是说: 当一个公司sue一个independent supplier时，是因为the independent supplier雇了the company的职员了吗？

如果是这个意思，hire应该用过去时吧?或者when放到 the independent前？总感觉原句有些理解歧义？