Schizophrenia Was Not Included in the World Health Organization Mental

Schizophrenia was not included in the World Health Organization Mental Health Survey Consortium 2004) ,however,researchers were not so concerned because

A) previous research has shown that schizophrenia is strictly a North American phenomenon.
B) previous research has shown that many people diagnosed with schizophrenia would also receive a diagnosis included in the surveys.
C) schizophrenia was not of interest to the researchers.
D) all of the above.