The Demise of Moral Management Occurred for All of the Following

The demise of moral management occurred for all of the following reasons EXCEPT

A) research showed that it had never been effective.
B) the rise of the moral hygiene movement put a focus on patient well-being.
C) the rise of biological explanations diminished the importance of the social environment.
D) hospital facilities got so large that it was difficult to maintain the staff-patient relationships necessary for moral management.