As a result of deinstitutionalization, which of the following has become a significant provider of mental health services in parts of the United States?

A) Homeless shelters
B) Community food banks
C) Prisons
D) Private homes

Prisons have become a significant provider of mental health services in parts of the United States due to deinstitutionalization. Many individuals with mental illness end up in the criminal justice system, and prisons are often ill-equipped to provide adequate mental health treatment. However, they have become a de facto provider of mental health services for this population.