求教NN：GWD7-31

求教：搜索过，但不明白，E为什么不对呀？我觉得他是正面加强，更直接。

谢谢NN，指点我一下。

Q31:

Studies in restaurants show that the tips left by customers who pay their bill in cash tend to be larger when the bill is presented on a tray that bears a credit-card logo.  Consumer psychologists hypothesize that simply seeing a credit-card logo makes many credit-card holders willing to spend more because it reminds them that their spending power exceeds the cash they have immediately available.

Which of the following, if true, most strongly supports the psychologists’ interpretation of the studies?

1. The effect noted in the studies is not limited to patrons who have credit cards.
2. Patrons who are under financial pressure from their credit-card obligations tend to tip less when presented with a restaurant bill on a tray with credit-card logo than when the tray has no logo.
3. In virtually all of the cases in the studies, the patrons who paid bills in cash did not possess credit cards.
4. In general, restaurant patrons who pay their bills in cash leave larger tips than do those who pay by credit card.
5. The percentage of restaurant bills paid with given brand of credit card increases when that credit card’s logo is displayed on the tray with which the bill is prepared.

文章的逻辑是，人们看到LOGO之后就记起了自己的spending power比自己的Cash多，于是就多给tip。

文章只关心是多给Tip和Logo的关系。而且加强的时候只要加强文中提到的那个解释“认识到自己的spending power比自己的Cash多于是会多给tip”。但是E只涉及logo和付款方式，不涉及tip。所以显然E是无关的（付款方式和tip之间缺乏联系）。