费解的OG10一道逻辑题

Sales of telephones have increased dramatically over the last year. In order to take

advantage of this increase, Mammoth Industries plans to expand production of its own

model of telephone, while continuing its already very extensive advertising of this product.

Which of the following, if true, 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 of the telephones that it produces, Mammoth Industries’ share of all

telephone sales has declined over the last year.

(B) Mammoth Industries’ average inventory of telephones awaiting shipment to retailers

has declined slightly over the last year.

(C) Advertising has made the brand name of Mammoth Industries’ telephones widely

known, but few consumers know that Mammoth Industries owns this brand.

(D) Mammoth Industries’ 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 Mammoth Industries’ telephones

have fallen in the last year.

答案选E。奇怪，题目一开头明明就说Sales of telephones have increased dramatically over the last year，E选项确是sales of Mammoth Industries’ telephones have fallen。怎么能够连题目前提都可以是错误的呢？