According to current research, which of the following is most likely to be true about the cause of same-gender sexuality?
a. Genetic variance on the X chromosome is responsible for most causes of same-gender sexuality.
b. Same-gender sexuality or heterosexuality is mostly a learned behavior brought on by rewards and punishments.
c. Same-gender sexuality is caused by societal influences and labels.
d. There are likely many causes of same-gender sexuality, not just one.