In an instrumental aggression, the main aim is to_________.

The correct option is Attain non-aggressive goals.

Aggression in psychology is generally classified into different types based on the underlying motivation and goals of the behavior. The two primary forms are hostile aggression and instrumental aggression.
1. Hostile Aggression: This type of aggression is driven by anger, impulse, or emotion. The primary and ultimate goal is to inflict pain, injury, or harm (either physical or psychological) upon the opponent or victim.
2. Instrumental Aggression: This is a goal-oriented, calculated behavior where aggression is used simply as a tool or "instrument" to achieve a specific outcome. The primary aim is not to hurt the victim, but rather to secure a non-aggressive reward, resource, or status (such as gaining money, winning a game, obtaining territory, or securing a victory). The harm caused is merely a byproduct of achieving that ultimate, non-aggressive objective.

Therefore, in instrumental aggression, the main aim is to attain non-aggressive goals.