In Cattle, a Freemartin Is an Infertile Female with Masculinized

In cattle, a freemartin is an infertile female with masculinized behavior that shared a placental vascular connection with its male twin.The most likely explanation for how this could occur is that

A) the female twin has an XY genotype.
B) the male twin has an XX genotype.
C) androgens from the developing male twin circulated to the female twin, masculinizing it in utero.
D) the female twin has androgen insensitivity syndrome.
E) the female twin lacks receptors for estrogen.