Which symptom would most likely complicate the diagnosis of bipolar disorder in an adolescent with ongoing mood swings?

A. Predominantly aggressive outbursts without other mood alterations can complicate the diagnosis of bipolar disorder because aggression alone is nonspecific. While irritability or anger can occur in bipolar disorder, isolated aggressive behavior may overlap with other conditions such as oppositional defiant disorder (ODD), conduct disorder, or ADHD, making it difficult to distinguish bipolar disorder based solely on aggression. Accurate diagnosis requires clear evidence of mood episodes (mania, hypomania, or depression) rather than isolated behavioral outbursts. B. Difficulty with academic focus and performance is common in adolescents with bipolar disorder due to attention difficulties, mood fluctuations, or comorbid ADHD. While it is a symptom, it is nonspecific and would not in itself complicate diagnosis as much as isolated aggression. C. Fluctuations between feelings of excitement and apathy are consistent with bipolar disorder, reflecting alternating manic/hypomanic and depressive states. This pattern supports the diagnosis rather than complicates it. D. Consistent behavior of detachment from peers may indicate depression or social anxiety but is less likely to obscure the diagnosis of bipolar disorder if clear mood episodes are present. It is more of a supportive feature than a complicating factor.