Which Statement About Mammalian Embryonic Sexual Differentiation Is True

Which statement about mammalian embryonic sexual differentiation is true?

A) Concerted actions of the X and Y chromosomes cause the undifferentiated gonad to become male.
B) A steady high level of estrogens causes the undifferentiated gonad to become female.
C) The absence of estrogens causes the undifferentiated gonad to become male.
D) The absence of androgens causes the undifferentiated gonad to become female.
E) The X chromosome alone causes the undifferentiated gonad to become female.