Compared with those in small towns, people in large cities have

A．it's unnecessary for good people to do anything in face of evil.
B．it's certain that evil will prevail if good men do nothing about it.
C．it's only natural for virtue to defeat evil.
D．it's desirable for good men to keep away from evil.

A．stricter discipline should be maintained in schools and families.
B．more good examples should be set for people to follow.
C．more restrictions should be imposed on people's behavior.
D．more people should accept the value of accountability.