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