From the passage, we can safely conclude that compulsive spenders or compulsive bargain hunters ______.

A．the psychology of money-spending habits
B．the purchasing habits of compulsive spenders
C．a special psychology of bargain hunting
D．the use of the psychology of spending habits in business

A．All people spend money for exactly the same reason that they need to buy things.
B．Business people and advertisers can use the psychology of money to increase sales.
C．Business people understand the psychology of compulsive buying better than scientists do.
D．Compulsive bargain hunters do not have problems with money.