The most convenient data for analysis of prevalence rates of a particular psychiatric disorder are obtained?

According to the course text, the term “race”:

A.regards everything in our inner world as originating from our relationship with our biological mother.
B.addresses questions of personal authenticity
C.may be considered an outdated term
D.None of the above

The most convenient data for analysis of prevalence rates of a particular psychiatric disorder are obtained:

A.by conducting unbiased experiments.
B.by contacting people by phone
C.in clinical settings
D.by using prison population samples