Which Statement DOES NOT Reflect Current Research on the Origins

Which statement DOES NOT reflect current research on the origins of sexual orientation?

A) The more older brothers a man has,the more likely he is to be gay.
B) There is differences in size of the hypothalamus between gay and heterosexual men.
C) The more older sisters a woman has,the more likely she is to be gay.
D) There is evidence that sexual orientation is at least partly genetic.