Twin studies indicate that?

Twin studies indicate that
A ) there is a genetic basis for homosexuality in males as well as in females.
B ) early family environment is more important than genes for the development of homosexuality.
C ) a male child whose older twin sisters are heterosexual is more likely to be homosexual.
D ) homosexual women are likely to have homosexual male relatives.
E ) identical male twins are less likely to be concordant for homosexuality than are fraternal male twins.