Which Historical Event Marked the Beginning of the Evolution of Psychotropic

Which historical event marked the beginning of the evolution of psychotropic medications?

A) The selective serotonin reuptake inhibitor (SSRI) classification of antidepressants was developed.
B) Lithium was discovered in Australia.
C) Clozapine, the first atypical antipsychotic drug, was marketed in the United States.
D) Chlorpromazine, the first antipsychotic, is "discovered" in France.