Which Behaviour Is Most Likely to Indicate That a Student

Which behaviour is most likely to indicate that a student has a possible emotional or behavioural disorder?

A) Betty's mind is often on her boyfriend rather than on classroom discussions.
B) Eliza sometimes forgets to do her homework assignments, even though she really likes her teacher and wants to please him.
C) Harrison is often more interested in socializing with his friends than in paying attention to his teacher.
D) Jeff is usually sombre and uncommunicative; the only time he speaks to other students is to insult them.