The dramatic rise in the number of homeless people in the 1980s cannot be attributed to the discharge of mentally ill persons from hospitals into "community care. " even though it is true that provisions for such community care are for the most part nonexistent. Which of the following, if true, best supports the claim above？

A. The policy of discharging mentally ill persons from hospitals was based on the supposition that their illnesses couldbe controlled by newly developed drugs.
B. Without supervision in a hospital setting those people whose mental illness can be controlled by medication might not actually take prescribed medication.
C. Some community-care programs for mentally ill persons did exist in the 1980" s, but those programs consisted primarily of outpatient clinics.
D. The policy of discharging significant numbers of mentally ill persons from hospitals took effect in the 1960"s.
E. There have always been some people in large cities who have led a homeless existence.