An example of internalization of behaviors as a result of stress is
A. aggression.
B. lack of interest in friends or activities.
C. vandalism
D. irritability

D; Irritability

Explanation:

Although it seems to me that any of these symptoms could result from internalization save for vandalism, I would go with irritability because if you are extremely stressed and internalizing your emotions, you are most likely to be irritable. Hope this helped! :)