我的理解：这题正确答案直接否定了题目开头给的销量增长，从而达到削弱作用。但是不是说：如果前提是事实，则不可以质疑前提的真实性。那正确答案直接质疑了题目的真实性，是不是错了？ 原题：Sales of telephones have increased dramatically over the last year. In order to take advantage of this increase, Mammoth Industries plan to expand production of its own model of telephone, while continuing its already very extensive advertising of this product.
Which of the following , if ture, provides most support for the view that Mammoth Industries cannot increase its sales of telephones by adopting the plan outlined above?
A. Although it sells all the telephones that it produces, MI' share of all telephone sales has declined over the last year. B. MI 's average inventory of telephones awaiting shipment to retailers has declined slightly over the last year. C. Advertising has made the brand name of MI 's telephones widely known, but few consumers know that MI owns this brand. D. MI's telephone is one of three brands of telephone that have together accounted for the bulk of the last year's increase in sales. E. Despite a slight decline in the retail price, sales of MI's telephones have fallen in the last year. 正确答案是E，该如何理解
