Because Brooke's Relationships Are Filled with Conflict and Constant Ups

Because Brooke's relationships are filled with conflict and constant ups and downs, she has trouble keeping friends around. Many people say that they never know what to expect from her. One day she thinks you are the best friend ever, and the next day she seems to think you are the worst friend ever. There never seems to be a middle ground with her. Her mood swings and the unstable nature of her relationships with her friends, family, and co-workers have taken a toll on her. She decides that she should talk to a therapist about how to get her friends and family to be more reasonable. If she has a personality disorder, it is most likely

A) antisocial personality disorder.
B) obsessive-compulsive personality disorder.
C) borderline personality disorder.
D) narcissistic personality disorder.
E) avoidant personality disorder.