Which of the following traits is characteristic of borderline personality disorder?

Impulsiveness is a hallmark trait of borderline personality disorder (BPD). Individuals with this condition often exhibit sudden and intense urges that can lead to reckless behaviors, such as spending sprees, substance abuse, or risky sexual activities. This impulsivity is typically a response to emotional instability and can be exacerbated by feelings of emptiness or fear of abandonment, which are also common in BPD.

In the context of the other options, stable relationships would not be characteristic of BPD. Instead, individuals often experience tumultuous and unstable relationships, where they may oscillate between extremes of idealization and devaluation of others. Inflexibility is also not a trait associated with BPD; rather, those with this disorder may have issues with emotional regulation that make their behavior appear varied and unpredictable. Detachment, while sometimes present in other personality disorders, does not align with the emotional intensity that characterizes BPD, where individuals typically have significant difficulty managing emotions and may have intense interpersonal relationships despite their instability.