一道prep的逻辑题

sissi8466

Outsourcing is the practice of obtaining from anindependent supplier a product or service that a company has previouslyprovided for itself.  Vernon, Inc., asmall manufacturing company that has in recent years experienced a decline inits profits, plans to boost its profits by outsourcing those parts of itsbusiness that independent suppliers can provide at lower cost than Vernon canitself.Whichof the following, if true, most strongly supports the prediction that Vernon'splan will achieve its goal?
(A)Among the parts of its business that Vernon does not plan to outsource are somethat require standards of accuracy too high for most independent suppliers toprovide at lower cost than Vernon can.
(B)Vernon itself acts as an independent supplier of specialized hardware items tocertain manufacturers that formerly made those items themselves.
(C)Relatively few manufacturers that start as independent suppliers have been ableto expand their business and become direct competitors of the companies theyonce supplied.
(D)Vernon plans to select the independent suppliers it will use on the basis ofsubmitted bids.
(E)Attending to certain tasks that Vernon performs relatively inefficiently hastaken up much of the time and effort of top managers whose time would have beenbetter spent attending to Vernon's core business.
答案是E,我想问下怎样确定这个答案啊，看上去好像和题目没什么直接的联系，怎样去支持题中的结论呢？请各位牛牛们帮忙解答，谢谢！

Lunaqi

同问。
我觉得D还有些道理，因为采用bid可以压低价格，达到增加利润的目的。
而E中提到了manager的time and effort问题，可是题干并没有明确指出manager花费更多的time和effort就可以增加profit啊