Answer:
b. They can cause significant disruption by destroying only a few targets.
Explanation:
In Cyber terrorism, Cyberterrorists use the Internet, computers or network to perform terrorizing acts, to obtain political or economical goals through coercion or violence, that can cause property damage or serious physical harm. It is an act of Internet terrorism in which criminal actions, include acts of intentional, large-scale destruction of computer networks via computer viruses, worms, malware, and similar malicious software.
Cyberterrorists target power plants, air traffic control centers and water systems to create disturbance and distress among people. These targets are desirable to cyberterrorists because these targets, consequentially, can drastically disrupt the usual activities of a large population. Also damaging only a few such targets can cause massive disturbance which might also leave a country, society or institution in chaos and fear of additional attacks. In a nut shell, cyberterrorists target power plants, air traffic control centers and water systems as it can result in serious damage and also disrupt normal lifestyle of people who somehow rely on these systems.