Which personality disorder is marked by instability in interpersonal relationships, self-image, and emotions?

The personality disorder characterized by instability in interpersonal relationships, self-image, and emotions is Borderline Personality Disorder (BPD). Individuals with BPD often experience intense emotional swings and have difficulty managing their emotions, leading to volatile relationships. They may have a distorted self-image and oscillate between extremes of idealization and devaluation in their relationships. This instability can result in impulsive behavior and challenges in maintaining a sense of self, often leading to feelings of emptiness.

The other personality disorders listed have distinct features that do not align with the specific description of instability found in BPD. For instance, Dependent Personality Disorder involves a pervasive and excessive need to be taken care of, leading to submissive behavior, which doesn't capture the emotional and relational instability of BPD. Narcissistic Personality Disorder is primarily focused on grandiosity and a need for admiration, although it can include difficulties in relationships, it doesn’t exhibit the same depth of emotional instability. Obsessive-Compulsive Personality Disorder focuses on orderliness, perfectionism, and control at the expense of flexibility, which also does not correspond with the themes of instability described in the question.