Which of the following adjectives can best describe the author's attitude toward water pollution problem

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

A．less difficult to control than non-point pollution
B．the minor pollution source
C．more difficult to control than non-point pollution
D．a problem that cannot be solved