Rates of Mental Disorders Are

Rates of mental disorders are 

A) higher in the United States than in most other countries, due to superior diagnostic methods. 
B) higher in the United States than in most other countries, due to higher levels of stress. 
C) lower in the United States than in most other countries, due to the stigma attached to mental disorders within the public and medical communities. 
D) lower in the United States than in most other countries, due to the higher levels of poverty, war, and stress outside the U.S.