Which Research Purpose Is Not a Purpose of Qualitative Research

Which research purpose is not a purpose of qualitative research?

A) To understand how patients decide whether to have a particular surgical procedure
B) To describe the culture of a rural home care agency
C) To develop a theory of how spouses and partners of persons who are attempting to stop smoking support the "quitter"
D) To determine the effectiveness of forced-air warming blankets in preventing shivering with women who are actively giving birth