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

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

A．Social change tends to meet with more difficulty in basic and emotional aspects of society.
B．Disagreement with and argument about conditions tends to slow down social change.
C．Social change is more likely to occur in the material aspect of society.
D．Social change is less likely to occur in what people learned when they were young.