A ____ is dangerous because it has the capability of traveling without being detected and to replicate itself in great volume.

A) malware
B) virus
C) worm
D) spyware

The characteristic mentioned in the statement, i.e. the ability to replicate itself in great volume without getting detected, is a characteristic of a worm. Malware, virus, and spyware do not necessarily have the capability to replicate themselves in great volume.