A suitable title for this passage would be ______.

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

A．Two contrasting views of a problem are presented.
B．A problem is examined and complementary solutions are proposed or offered.
C．Latest developments are outlined in order of importance.
D．An innovation is explained with its importance emphasize