问题详情

We can learn from the first paragraph that ______.
A．people are getting much richer than before
B．it"s necessary for people to accept the concept of exchanging the money for something of comparable value
C．there is a decline in product quality that people have to renew them all the time
D．commercials are making us happier and more content请帮忙给出正确答案和分析，谢谢！