In a Longitudinal Study of Women Who Initially Identified as "Lesbian

In a longitudinal study of women who initially identified as "lesbian," "bisexual," or "unlabeled," women's self-description of their sexual orientation often changed over time, based on their current relationships. This supports the idea that

A) most lesbians are actually bisexual.
B) most bisexuals are actually lesbians.
C) women's sexual orientation is more fluid than men's.
D) most women are confused about their innate sexual orientation.
E) a woman's sexual orientation is determined by changes in reproductive hormones over her lifetime.