OG阅读第402页第257题

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257.According to the passage, all of the following benefits associated with backward integration EXCEPT

A. improvement in the management of overhead expenses;

B. enhancement of profit margins on sales of components;

C. simplifciations of purchases and marketing operations;

D. reliability of a source of necessary components;

E. elmination of unncessary research efforts.

答案为B,D为什么被排除？