What Is a Major Difference Between the Development of Drosophila

What is a major difference between the development of Drosophila or Xenopus and that of humans?

A) Drosophila and Xenopus do not undergo gastrulation;humans do.
B) Drosophila and Xenopus undergo metamorphosis;humans do not.
C) Drosophila and Xenopus do not show development of germ layers;humans do.
D) In Drosophila and Xenopus,the notochord remains;in humans,it disappears.
E) Drosophila and Xenopus do not undergo blastula formation;humans do.