The author argues that educating girls in developing countries is ______.

A．unequal treatment of boys and girls in developing countries
B．the potential earning power of well-educated women
C．the major contributions of educated women to society
D．the economic and social benefits of educating women

A．Great scientists are also great artists.
B．The left side of Einstein's brain is very powerful.
C．Einstein is a genius whose two sides of the brain are strong.
D．The two sides of the brain are equally important.