请教三道逻辑题 - ChaseDream

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

A. In Bellaria all medical expenses are paid by the government, so that personal income does not affect the quality of health care a person receives.
B. The Wistar region is one of Bellaria’s least populated regions.
C. Many people who live in the Wistar region have moved there in middle age or upon retirement.
D. The many opportunities for hiking, skiing, and other outdoor activities that Wistar’s mountains offer make it a favorite destination for vacationing Bellarians.
E. Per capita spending on recreational activities is no higher in Wistar than it is in other regions of Bellaria.

答案选C。但是我觉得B也可以的啊，比如说W有三个人，最大年龄分别是60、60、25；另有一城有五个人，最大年龄分别是60、60、25、24、23（原谅我如此极端的假设，只是为了说明问题方便）.这样W的人均寿命就长了啊。而且C在我看来是可以成立的，即使是中年或者退休过去，也可以因为锻炼而长寿啊。难道题目默认lifestyle是长久习惯么，明明不同阶段也有不同来着

3.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. Pro?ts 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’ pro?ts.
B. Most of the people who bought Dietz’s canned tuna for the ?rst time as a result of the campaign were already loyal customers of other Dietz products.
C. A less expensive advertising campaign would have brought in signi?cantly fewer new customers for Dietz’s canned tuna than did the campaign Dietz Foods launched last year.
D. Dietz made money on sales of canned tuna last year.
E.In each of the past ?ve years, there was a steep, industry-wide decline in sales of canned tuna.

这个答案选E而我做的时候选了B.我觉得B可以证明即使一时亏损但ad canpaign 是可以有长远效益的。E的话……总觉得是拐了弯的间接推理呐……