请教OG12 一道逻辑题

deadbeat56

  A year ago, Dietz Foods launched a yearlong advertising campaign for its canned tuna. Last year Dietz sold 12 million cans of tuna compared to the 10 million sold duriong the previous year, an increase directly attributable to new customers brought in by the campaign.Profits from the additional sales,however,were substantially less than the cost of the advertising campaign.Clearly, therefore, the campaign did nothing to further Dietz's economic interests.

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

  (c) A less expensive advertising campaign would have brought in significantly fewer new customers for Dietz's canned tuna than did the campaign Dietz Foods lauched last year.

  (e) In each of the past five years, there was a steep,industry-wide decline in sales of canned tuna.

  我选的是C 虽然觉得它不够正确。但是答案是E 我不能理解。请哪位高人指点一下啦。

lollypp

c说另一个广告了，无关

E:说过去5年，canned tuna销售量急剧下滑；而题中指出做广告给其带来新的顾客，并提升了销售量，虽然成本高了，但可以削弱campaign did nothing to further Dietz's economic interests.

deadbeat56

就是说 只要有more sales 就不算是 do nothing to further economic interests了呗 不管有没有profit？ 明白了 谢谢。