How Have Scientific Advances Supported Hirschfeld's Views About Influences on Sexual

How have scientific advances supported Hirschfeld's views about influences on sexual behavior?

A) Neurologists have identified the three centers in the brain that Hirschfeld theorized were responsible for sexual attraction.
B) Biomedical researchers have shown that homosexual and heterosexual individuals have different sex hormones.
C) Animal researchers have found that prenatal hormone levels influence adult sexual behavior.
D) Geneticists have proven that genes do not influence sexual orientation.
E) Psychotherapists have proven that family problems in childhood are the main influence on sexual behavior.