31 In the womb, the body of a developing fetus is female by default and becomes male if the male-determining geneknown as SRY is present.
(A) The SRY gene does not affect the female fetus, but it helps the male fetus develop into a boy baby.
(B) The SRY gene changes the sex of the developing fetus by changing the biological conditions of the womb.
(C) The SRY gene determines whether a male fetus will grow into a boy baby, or a female one will grow into a girl baby.
(D) If the SRY gene exists, the fetus will grow into a boy baby; otherwise, all fetuses will become girl babies.