Which Evidence Supports the Idea That Traditional Antipsychotic Medications Act

Which evidence supports the idea that traditional antipsychotic medications act on the dopamine system?

A) There is a decrease in dopamine-induced prolactin release from the pituitary gland during treatment with antipsychotic drugs.
B) There is no correlation between the potency of an antipsychotic drug and its ability to displace a labeled ligand from dopamine receptors.
C) antipsychotic drugs cause parkinsonian side effects, which are known to involve dopamine.
D) antipsychotics that have a higher affinity for DA receptors and do not require higher doses to be clinically effective.