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.

基本上看不懂题目和选项,大牛请指点

我认为选B。 B选项就是原文的逆否命题。原文中，心理学家解释说：消费者消费多，是因为credit-card logo让消费者觉得他可以exceeds the cash they have immediately available（消费者可以多消费）。B选项则是说，Patrons who are under financial pressure from their credit-card obligations（消费者不可以多消费），于是消费便少了。。