Why Are Epithelial Cells Continually Being Shed from the Villi

Why are epithelial cells continually being shed from the villi

A) The intracellular enzymes digest important cellular constituents, causing the cells to disintegrate and slough.
B) New cells are continually being produced in the crypts at the base of the villi and they migrate upward.
C) The body needs a continual supply of protein derived from the digestion of these cells.
D) Acid entering the small intestine from the stomach constantly destroys the small intestinal lining, causing the cells to slough.

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