After an Unsuccessful Trial with Fluphenazine (Prolixin), a Patient's Medication

After an unsuccessful trial with fluphenazine (Prolixin) , a patient's medication was changed to trifluoperazine (Stelazine) . Three months later the patient is still hallucinating and delusional. What is the most likely explanation for the persistent symptoms?

A) Trifluoperazine (Stelazine) is a low-potency antipsychotic, and the patient might need higher doses.
B) The patient has not taken trifluoperazine (Stelazine) long enough to decrease symptoms significantly.
C) Delusions and hallucinations are negative symptoms of schizophrenia that do not respond to traditional antipsychotic medications.
D) Both fluphenazine (Prolixin) and trifluoperazine (Stelazine) are traditional antipsychotics, and the patient does not respond well to this class of drug.