The correct answer is option (C):
Piracy
The correct answer is piracy. Piracy specifically refers to the unauthorized use or reproduction of another's work, especially copyrighted material like books, music, movies, and software. The other options are incorrect because:
Copyright is the legal right granted to the creator of original works, giving them exclusive control over how their work is used. However, it doesn't describe the act of infringement itself.
Patent protects inventions and gives the inventor exclusive rights. It is not related to the unauthorized use of creative works.
Privacy is the state of being free from unwanted intrusion or public attention.
Replica is a copy or close imitation of something. While a replica could be a result of piracy, it doesn't encompass the illegal act itself.