The archenteron develops into D. the lumen of the digestive tract.
During the process of gastrulation, the endoderm which is the inner layer surrounds the archenteron. Archenteron is the primary digestive tube that will form the lumen of the digestive tract further. The archenteron is formed during the starting stage of gastrulation.
The archenteron is also referred to as the gastrocoel.
Option A is not correct as mesoderm leads to the formation of connective tissues.
Option B is not correct as the endoderm surrounds the archenteron and it is the archenteron that forms the lumen of the digestive tract.
Option C is not correct as cells from the placenta will form the outer layer during the development of a blastocyst.
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