The author of this article warns that computer-related injuries, at worst, can cause ______.

A．prefer to wait for the criminal to give himself away
B．spend a lot of effort on trying to track down their man
C．try to make a quick arrest in order to keep up their reputation
D．usually fail to produce results

A．so that he can catch criminals in the streets
B．because many of the criminals he has to catch are dangerous
C．because he has to know nearly as much about law as a professional lawyer
D．so that he can justify his arrests in court