___ is considered as an aggressive behaviour and will most likely bring negative response from the speaks.

The correct answer is (C) Shouting.

• Logical Principle: Communication etiquette defines aggressive behavior as any verbal or non-verbal action that violates social norms, disrupts interpersonal harmony, or intimidates the listener.
• Step-by-step Deduction: 1) Nodding is a sign of agreement or active listening. 2) Staring can be considered impolite, but it is passive. 3) Shouting is a clear demonstration of aggressive vocal intensity intended to dominate or intimidate, which inherently triggers a defensive or negative response from the interlocutor. 4) Showing a thumb is generally interpreted as a gesture of approval, though context-dependent.
• Verification: Shouting is explicitly categorized under hostile interpersonal communication strategies. Unlike the other options which are either neutral, encouraging, or ambiguous, shouting is universally recognized in behavioral science as an act of aggression that invites a negative reaction.