Professor Ruggs Tells Her Class That Research Has Shown That

 Professor Ruggs tells her class that research has shown that schizophrenia occurs

A) most frequently among people from the upper and middle socioeconomic statuses.
B) most frequently among people from the lower socioeconomic status.
C) without respect to a person's socioeconomic status.
D) more commonly among men from the lower socioeconomic status and women from the upper and middle socioeconomic statuses.