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?
- The effect noted in the studies is not limited to patrons who have credit cards.
- 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.
- In virtually all of the cases in the studies, the patrons who paid bills in cash did not possess credit cards.
- In general, restaurant patrons who pay their bills in cash leave larger tips than do those who pay by credit card.
- 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.
原文说用现金付帐的人比用信用卡付帐的人给的小费多，然后提出心理学家的一个解释――信用卡logo对人支付行为的影响。题干要support，就是要加强信用卡与付得小费少之间的联系。
A. 提到not limited to patrons who have credit cards无关；
B. 正确，讲credit card 和
tips less成功架桥；
C. 无关，因为提到用cash付帐的人；
D. 只是陈述原论证已经提过的信息，且用cash付帐的人作为focus，无关；
E. 无关，提到the percentage of restaurant bill 与tips没有任何联系
答案是B, 但是这么解释实在是不太明白. 因为我对这到题的理解不是用现金付帐的人比用信用卡付帐的人给的小费多.可以求那为帮忙解释一下为什么是B 吗? 谢谢 | 
