Shannon, a junior in high school, was recently suspended from school for stealing money from ninth-graders, writing graffiti on the bathroom walls, and beating up another student. shannon's teacher reports that she has very few friends. the most likely diagnosis for shannon would be

the most likely diagnosis for shannon would be: conduct disorder

conduct disorder is most commonly known as 'anti-social behavior'.
Is a form of the behavioral disorder that make a person have the tendency to do everything that society tells "what we're not supposed to be doing".
People who have this kind of behavior generally are in adolescent age.