Step 1: Concept Identification: The question pertains to a psychological and communication theory on persuasion and resistance, specifically addressing the impact of prior warnings on an individual's susceptibility to persuasive messages.
Step 2: Theoretical Analysis: The following theories are examined:
- (A) Cultivation effect: Posits that prolonged media exposure influences perceptions of reality to align with media portrayals, focusing on long-term belief shaping rather than immediate resistance.
- (B) Inoculation effect: Developed by William J. McGuire, this theory employs a medical analogy. Similar to a weakened virus conferring immunity, exposure to a diluted persuasive argument, followed by refutation, builds resistance to stronger future attempts. A pre-warning about an impending persuasive effort triggers defensive mechanisms, aligning with the scenario.
- (C) Limited effect: A broad media theory suggesting minimal media impact due to active audiences whose existing beliefs and social networks are more influential. It does not specifically detail warning mechanisms.
- (D) Personal influence effect: Related to the two-step flow of communication, this theory highlights the role of "opinion leaders" in filtering and disseminating media messages through interpersonal networks.
Step 3: Conclusion: The inoculation theory best explains how a forewarning enhances an audience's resistance to persuasion. Therefore, option (B) is the correct response.