In Fruit Flies (Drosophila), an Embryo During Gastrulation

In fruit flies (Drosophila) , an embryo during gastrulation:

A) begins enclosing nuclei within their own cell membranes.
B) forms its three germ layers.
C) becomes organized into distinct segments.
D) forms three germ layers and becomes organized into distinct segments.
E) begins enclosing nuclei within their own cell membranes, forms three germ layers, and becomes organized into distinct segments.