Answer:
Instrumental aggression
Explanation:
Agression can be said to be any form of behavior which is intended to harm another person, oneself, or an object.
Instrumental Aggression can be defined as the intentional use of harmful behavior(s) to achieve some other goal (war, gang violence, organized crime, football).
Nicole pushing her friend just to achieve her goal of having the cookie is what Instrumental aggression embodies according to its definition. Making use of a harmful situation(pushing) to achieve a goal (cookie).
