The correct option is
D All of the above
Gastrulation is a process in which the blastula converts into a gastrula. The morphogenetic movements take place during the gastrulation which involves the movement of cells to form three different germ layers which are the ectoderm, endoderm, and mesoderm. During gastrulation, the differentiation of our archenteron also takes place.
So, the correct option is 'All of the above'