A 12- year- old girl persistently misbehaves at home. Recently she called 911, reporting that her parents were forcing her to go to school and threatening to run away. She also locked her younger siblings out of the house in cold weather. Although her parents attempt to set limits, she frequently responds with prolonged tantrums- crying and shouting, flailing her arms, and breaking objects in her home. Once she "gets her way" she settles down immediatley. After one serious tantrum, her parents took her to the emergency department and the girl was admitted to the psychiatric unit. The pt was viewed as quite charming by several members of the staff, whereas others though she was "a very, very difficult pt." What is the likely diagnosis?

A. Attention- deficit/ hyperactivity disorder.
B. Conduct disorder.
C. Intermittent explosive disorder.
D. Oppositional defiant disorder.