According to the author, Kids' Country is partially caused by ______.

A．water pollution is the most serious one in all kinds of pollution
B．both point-source and non-point pollution are serious problems
C．point-source pollution is an unimportant problem
D．water pollution can only be controlled by the law

A．take some legal actions to stop water pollution
B．include the control of non-point pollution in its water pollution control program
C．continue and emphasize the national water pollution control program
D．warn people to pay more attention to water pollution