Regarding Title VII Protection of Transsexuals from Employment Discrimination

Regarding Title VII protection of transsexuals from employment discrimination:

A) the federal courts have recognized a cause of action based on the argument that the change of gender is a protected trait.
B) the federal courts have not recognized a cause of action based on the argument that the change of gender is a protected trait.
C) only state courts are allowed to apply Title VII to these cases.
D) such claims must be based upon the original gender of the plaintiff.