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?

• 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.

我總覺得要支持 心理學家的論點  答案應該是E

但標準答案是 B... 真無言...Orz...

請高手指導阿~