请教OG12一道题Dietz Foods launched a yearlong advertising campaign

adriennedeng

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 during 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?
A Sales of canned tuna account for a relatively small percentage of Dietz Foods' profits.  分析A选项
B Most of the people who bought Dietz's canned tuna for the first time as a result of the campaign were already loyal customers of other Dietz products.  分析B选项
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 launched last year.  分析C选项
D Dietz made money on sales of canned tuna last year.  分析D选项
E In each of the past five years, there was a steep, industry-wide decline in sales of canned tuna.  分析E选项
题目要削弱campain对further economic interests没有任何作用
感觉可以从以下几个方面削弱：1new customers带来了别的产品销量增加 2新顾客未来成为老顾客 3没有campaign会下降得更多 AB向1靠拢但是没点明别的产品销量是否增加 B吸引的tuna新顾客是其他产品的老顾客 不可能促进其他产品的销量 加强了结论
C和E方向一致，不这么做吸引的顾客更少带来的利润更小 为什么C错误呢？
很多解释说C是无关选项 不是很明白，求教！

离七

结论是the campaign did nothing to further Dietz's economic interests
c说 便宜一些的广告吸引来的顾客更少，去年的这个广告吸引的顾客多一些，既然吸引到了顾客就说明了带来了经济利益，不能weaken

Carol凡凡

题目要削弱“广告对D公司的生意没用”这一观点，也即是要证明“广告对D公司的生意是有帮助的”。
一般做到这种关于business的题目，生意是否做得好就要去考虑它的竞争对手，和竞争对手的情况比较。
所以我认为E优于C，因为E是拿行业内其他公司的情况来进行比较，说明了广告帮助了D公司；而C是拿两个广告来比，这个方向不对。