What Contribution Did Neuroscientist Simon LeVay Make to the Understanding

What contribution did neuroscientist Simon LeVay make to the understanding of sexual orientation?

A) His research suggested the brains of homosexual men may be different from the brains of heterosexual men.
B) He discovered the gay gene and advocated it as the reason for sexual orientation.
C) He was the founder of Queer Nation, the largest gay rights advocacy group in America.
D) He conducted research in New Guinea that demonstrated three distinctly different gender behaviors.