Final answer:
Cyberterrorism is the correct answer as it refers to the use of the Internet to inflict damage by hacking into systems, stealing intelligence, and causing disruptions.
Step-by-step explanation:
The form of terrorism that uses the Internet to inflict damage is C. Cyberterrorism. Cyberterrorism involves governments and militant groups weaponizing cyberspace, hacking into systems to steal secret intelligence, disrupt communications, shut down internet services, and spread disinformation. The intention behind such acts can be to cause chaos, damage critical infrastructure, or influence the population by manipulating information.