A young adult patient with borderline personality and polysubstance use disorder was recently admitted to a psychiatric hospital. The patient has extreme mood fluctuations with bursts of anger, difficulty focusing on non-preferred topics, a tendency to interrupt, and a preoccupation with conflicts within family and friend networks.

Which of the following disorders is most likely comorbid with the patient's condition?

A) Bipolar disorder
B) Generalized anxiety disorder
C) Obsessive-compulsive disorder
D) Schizophrenia