作者：英吉
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?
A.The effect noted in the studies is not limited to patrons who have credit cards.
B.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.
C.In virtually all of the cases in the studies, the patrons who paid bills in cash did not possess credit cards.
D.In general, restaurant patrons who pay their bills in cash leave larger tips than do those who pay by credit card.
E.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.
题目分析：A说研究的影响范围问题，原文没有谈过，杀。B说给小费多少问题，留着。C说这些用现金付费的其实没有信用卡，没提，杀。D说反了，不能支持。E说某些特定的信用卡付费的比例增多，没说，杀。
