Which of the following disorders involves a fear of abandonment?

The disorder characterized by a fear of abandonment is Borderline Personality Disorder. Individuals with this condition often experience intense emotions, unstable relationships, and a profound fear that others will leave them. This fear of abandonment can lead to frantic efforts to avoid real or imagined separation or rejection. People diagnosed with Borderline Personality Disorder may react with anger, anxiety, or impulsive actions when they perceive that someone they are close to might leave them.

In contrast, the other disorders listed do not primarily center around the fear of abandonment. Narcissistic Personality Disorder typically involves a pervasive pattern of grandiosity and a need for admiration, often lacking in empathy toward others, rather than a fear of abandonment. Histrionic Personality Disorder is characterized by excessive emotionality and attention-seeking behavior, but it does not specifically emphasize abandonment fears. Antisocial Personality Disorder is marked by disregard for others' rights and social norms, often showing a lack of concern for interpersonal relationships rather than a fear of losing them. Therefore, Borderline Personality Disorder is the correct answer because the core struggle with fear of abandonment distinctly defines this condition.