Teresa punches a pillow every time she feels aggression building up toward her younger brother, and this makes her feel relieved and more relaxed. Such an outcome supports the notion of

catharsis

Explanation:

Catharsis can be described as the process of releasing or involves the release or emotional discharge that eventually help in achieving relief or liberation from anxiety.

In this case, the act of punching the pillow , which is exhibited by Teresa is the process of releasing her anger, and always help her to achieve relief or liberation from that anxiety or aggression toward her younger brother.  

catharsis.

Explanation:

A Catharsis is an emotional discharge through which one can achieve a state of moral or spiritual renewal, or achieve a state of liberation from anxiety and stress. Catharsis is a Greek word meaning “cleansing.” In literature, it is used for the cleansing of emotions of the characters. It can also be any other radical change that leads to emotional rejuvenation of a person.

the answer is:

c. economic output