The correct answer is a. striking out at others
Striking out at others involves redirecting one's frustrations, impulses and anger on a person that is unrrelated to one's cause of frustration. In this instance, Parker feels frustrated and angry about not being able to go to a concert with her friends, however instead of taking out her frustration on her parents, she is striking out at her brother, who has nothing to do with the cause of her frustration.