What Does the Trend of Deinstitutionalization Mean

What does the trend of deinstitutionalization mean?

A) Whenever possible, people with mental illness should be treated at community-based facilities that emphasize outpatient care.
B) Hospitalization for mental illness has become a thing of the past.
C) The environment inside mental hospitals is designed to be less structured and rigid.
D) Mental hospitals should take increased responsibility for the treatment of all clients, even those who are not seriously ill.