According to the passage, static electricity can be caused by ______.

A．rich people always tend to commit suicide
B．money can always bring happiness to children
C．life is always joyful for children born rich
D．it is love not money that brings happiness tn rich children

A．there are as many advantages to being poor as there are to being rich
B．being rich can bring more problems than being poor
C．rich children can be deprived of the thing they are most in need of
D．wealth brings more disadvantages than advantages to rich children