Final answer:
Aggressive behavior, characterized by open hostility and direct confrontation, is the easiest form of resistance to identify as it involves observable actions such as loud speech and confrontational body language.
Step-by-step explanation:
The easiest type of resistance to identify among passive, aggressive, apathetic, and passive-aggressive is aggressive. Aggressive behavior is often characterized by overt hostility, direct confrontation, and clear opposition. It involves active and open resistance, which may include raising one's voice, using strong language, or displaying physically confrontational actions, making it more noticeable than other forms of resistance such as passive or passive-aggressive, which are more subtle, or apathetic, which may appear as disinterest or indifference.