The archenteron of the developing sea urchin eventually develops into the option(c)i.e, digestive tract.
At the site of invagination, the archenteron possesses a blastopore—an entrance leading to the outside—which is known as an opening. The blastopore develops into the anus, the archenteron finally becomes the digestive tract's cavity, and the mouth appears as a new aperture. The indentation that really forms is known as the primitive streak in birds and mammals and the lip of the blastopore in amphibians and fish.
The dorsal lip and the primitive node (also called Hensen's node) are responsible for controlling each. The archenteron forms the digestive tract during gastrulation, while the blastopore either becomes the mouth (protostome) or the anus (deuterostome).
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