Which of the following diagnoses is classified under cluster B personality disorders?

Borderline personality disorder is classified under cluster B personality disorders, which are characterized by dramatic, emotional, or erratic behavior. This cluster includes disorders that often involve difficulties in regulating emotions and maintaining stable relationships. Borderline personality disorder specifically is marked by patterns of instability in interpersonal relationships, self-image, and emotional regulation, along with impulsive behaviors.

In contrast, the other diagnoses listed belong to different clusters: dependent personality disorder and avoidant personality disorder fall under cluster C, which is characterized by anxious and fearful behaviors. Paranoid personality disorder belongs to cluster A, which is defined by odd or eccentric behaviors. This classification system is essential for understanding the different ways personality disorders manifest and how they can affect individuals, highlighting the specific emotional and relational challenges associated with borderline personality disorder.