During the Mid-1900s, Why Were the Most "Difficult" Patients Transferred

During the mid-1900s, why were the most "difficult" patients transferred to the back wards of state hospitals, where they were often isolated, restrained, and punished?

A) to avoid disturbing the other patients who did not have severe symptoms
B) because the priority of state hospitals shifted from treating people humanely to maintaining order
C) to make it easier for staff to treat those with the most severe symptoms
D) because the most "difficult" patients needed additional treatment compared to other patients