In Which of the Following Ways Do Gay Men and Lesbians

In which of the following ways do gay men and lesbians appear to differ?

A) Research shows that the fraternal birth order effect is found in lesbians but not gay men.
B) Research shows that women,over time,tend to be more sexually fluid than men.
C) Research shows that fetal exposure to atypical hormones causes homosexuality only in men.
D) Research shows that fetal exposure to atypical hormones causes homosexuality only in women.