A 24-year-old female with unstable relationships, impulsivity, recurrent self-harm is diagnosed with borderline personality disorder. The most evidence-based psychotherapy is:

Correct option is B

DBT is the first-line psychotherapy for borderline PD, focusing on mindfulness, distress tolerance, emotional regulation, and interpersonal effectiveness.
Explanation of options: (a) ✘ Supportive therapy may help but not primary evidence-based. (b) ✔ Correct; DBT specifically designed for borderline PD. (c) ✘ CBT helps mood disorders, less effective in borderline PD. (d) ✘ Psychoanalysis not practical in acute instability.