Why Is There a Greater Incidence of Disobedient Hyper-Aggressive Children

Why is there a greater incidence of disobedient hyper-aggressive children being referred for psychotherapy in the United States than in Thailand?

A) In Thailand, children are taught by their culture to be submissive and deferent, whereas children in the United States are encouraged to be assertive and competitive.
B) There are more emotionally disturbed children in the United States than in Thailand.
C) Psychologists in the United States are better trained so there are fewer instances of behavior disorder going undetected.
D) Americans are more pro-active in requesting professional intervention in managing their out-of-control children.