When Is It Acceptable for a Researcher to Study Only

Multiple Choice

When is it acceptable for a researcher to study only participants from a specific group, such as a researcher studying depression in a sample of Native American women?

A) If the specific group being studied is especially prone to the problem being studied (e.g., if depression rates are higher in Native American women)
B) If the specific group being studied has participated in similar research previously (e.g., earlier studies of intelligence in Native American women)
C) If the researcher has special access to the specific group (e.g., the researcher works on a Native American reservation)
D) It is never acceptable for such a specific group to be studied.