The Primary Causal Factor in Sexual Orientation Is

Multiple Choice

 The primary causal factor in sexual orientation is

A) genetic, as determined by the fact that 50 percent of identical twins show concordance for homosexuality.
B) due to brain structure differences, as demonstrated by Simon LeVay's work on INAH-3.
C) due to prenatal androgens, as demonstrated by CAH syndrome in females.
D) not clearly understood and may include some or all of the above depending on gender.