The Major Difference Between the Human Male and Female Reproductive

The major difference between the human male and female reproductive systems is the

A) provision of a site for fertilization and embryo development in the female.
B) production of haploid gametes only by the male.
C) diploid polar bodies of the female.
D) generation of millions of eggs but only thousands of sperm each month.
E) presence of a duct system opening to the body's exterior only in females.