Women Experience Depression More Frequently Than Men Do

Women experience depression more frequently than men do.This discrepancy between rates of depression in men and women has been observed to ____.

A) be independent of race,ethnicity,social class,and country of residence
B) be dependent on race,ethnicity,social class,and country of residence
C) vary by race,ethnicity,social class,and country of residence
D) be causally related to race,ethnicity,social class,and country of residence