Studies in the restaurante show that the tips left by customers who pay their bill in cash tend to be larger when the bill is presneted on a tray that bears a credit-card logo. Cosumer 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's interpretation of the studies?
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.