Which Statement Is True

Which statement is true?

A) Male embryos are more vulnerable than female embryos therefore less likely to survive prenatally.
B) Female embryos are more vulnerable than male embryos therefore less likely to survive prenatally.
C) Male and female embryos are equally vulnerable prenatally making them equally likely to survive prenatally.
D) X sperm swim faster and reach the ovum first while the Y sperm is more resistant to genetic disorders.