The word "defied" in the fifth paragraph probably means ______.

A．Minor employers are more likely to commit crimes.
B．Crimes committed by computer experts are difficult to detect.
C．Computer criminals are usually from the cold regions.
D．There are too many criminals for the police to catch.

A．A child may accept another person's underestimate of his ability.
B．He may think that he is too young to make the most of his mental faculties.
C．A person may have the idea that he is incapable of doing good work.
D．Some old people don't believe that they are capable of learning anything new.