What happens during vicarious reinforcement?

A) Someone experiences an event that was previously associated with an unconditioned reinforcer.
B) Someone experiences an event that has both reinforcing and punishing properties.
C) Someone watches someone else do something and receive reinforcement.
D) Someone receives a reinforcement but fails to pay attention to it.

Vicarious reinforcement occurs when an individual observes someone else's behavior and the consequences that follow, which can either be positive or negative reinforcement. Therefore, choice C is the correct answer. Option A is incorrect because it refers to classical conditioning, not vicarious reinforcement. Option B is also incorrect because it refers to a mixed contingency, not vicarious reinforcement. Finally, option D is incorrect because it refers to a situation where the person didn't attend to the reinforcement, not vicarious reinforcement.