Which of the Following Statements Reflects "Circumstantial Evidence" for the Dopamine

Which of the following statements reflects "circumstantial evidence" for the dopamine theory of schizophrenia?

A) Amphetamines, which activate dopamine, can lessen psychotic symptoms in persons with schizophrenia.
B) The drug L-dopa, a dopamine agonist, is used to treat schizophrenic symptoms in patients with Parkinson's disease.
C) Antipsychotic drugs (neuroleptics) can produce side effects similar to those of Parkinson's disease (a disorder due to insufficient dopamine) .
D) Antipsychotic drugs (neuroleptics) act as dopamine agonists, increasing the amount of dopamine in the brain.