Based on Research Findings Discussed in the Text

Based on research findings discussed in the text

A) almost all mental patients were found incompetent to make a treatment decision
B) almost all patients with a diagnosis of schizophrenia were considered competent by the test procedure to make treatment decisions for themselves
C) because half of the patients with schizophrenia were shown by the test procedure test to be able to make competent treatment decisions, a diagnosis of schizophrenia alone does not rule out competence
D) because a patient was competent on the tests to make a treatment decision, it meant the patient was also competent to consent to participation in medical research