请教OG12-CR的94题

hjean926

94.Studies in restaurants show that the tips left bycustomers who pay their bill in cash tend to be largerwhen the bill is presented on a tray that bears a credit-card logo. Consumer psychologists hypothesize thatsimply seeing a credit-card logo makes many credit-card holders willing to spend more because it remindsthem that their spending power exceeds the cash theyhave 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 a
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 a
given brand of credit card increases when that
credit card's logo is displayed on the tray with
which the bill is presented.

我怎么都理解不了为什么选B啊。。

半阙

hypothesize：消费者看到托盘上的信用卡logo，想起来自己不差钱，所以多给小费。
B支持：在经济有压力的情况下，看到托盘上的信用卡logo，少给小费。

这是典型：A→B  支持：非A→非B