In Vertebrate Animals, Spermatogenesis and Oogenesis Differ in That ________

In vertebrate animals, spermatogenesis and oogenesis differ in that ________.

A) oogenesis begins at the onset of sexual maturity, whereas spermatogenesis begins during embryonic development
B) oogenesis produces four functional haploid cells, whereas spermatogenesis produces only one functional spermatozoon
C) the division of cytoplasm is unequal in oogenesis, whereas it is equal in spermatogenesis
D) oogenesis ends at menopause, whereas spermatogenesis is finished before birth
E) spermatogenesis is not completed until after fertilization occurs, but oogenesis is completed by the time a girl is born