The best title for this passage would be ________.

A．games are psychologically unhealthy
B．any artificially-created subspecies would be our enemy
C．the artificial creation of a subspecies unlike us is something that never happens
D．the real or imagined existence of an opposing subspecies is inherent in man's activities

A．hardly anyone tells them the truth
B．too many criminals escape from jail
C．nine-tenths of their work involves arresting people
D．society does not punish criminals severely enough