Final answer:
The Lembert stitch incorporates the seromuscular layer and submucosa. It is commonly used in gastrointestinal surgery. Option A.
Step-by-step explanation:
The stitch that incorporates the seromuscular layer and submucosa is the Lembert stitch. This type of stitch is commonly used in gastrointestinal surgery to close incisions or wounds in the intestine or stomach.
The seromuscular layer is located between the muscularis and submucosa layers of the alimentary canal. It consists of smooth muscle and connective tissue.
The Lembert stitch is designed to bring together the seromuscular layer and submucosa, providing secure closure and promoting healing.
So option A is correct.