The Fact That Dopamine Receptor Blockers Take Several Weeks to Exert

The fact that dopamine receptor blockers take several weeks to exert their antischizophrenic effects suggests that

A) blocking dopamine receptors triggers some slow-developing change that is the critical therapeutic effect.
B) dopamine plays no role in schizophrenia.
C) antischizophrenic drugs block dopamine receptors only after several weeks.
D) dopamine receptors play no role in schizophrenia.
E) larger doses should be used.