Final answer:
The correct answer is option a) Rationalization.
Step-by-step explanation:
The defense mechanism that Aaron is using in this situation is rationalization. Rationalization is a defense mechanism where an individual justifies or excuses their behaviors by substituting acceptable reasons for the less-acceptable real reasons.
In this case, Aaron is justifying his action of eating hours-old Chinese food from the garbage by explaining that it was in a Styrofoam container and that there was nothing but paper in the trash can, rather than addressing the underlying reasons he chose to eat discarded food, such as hunger or a disregard for social norms.