Which scenario is an example of physiologically important endocytosis in the intestinal epithelium?

• A. Neonatal uptake of maternal immunoglobulins (IgA/IgG) across enterocytes by vesicular transport.
• B. Absorption of water-soluble vitamins directly into hepatic sinusoids bypassing enterocyte vesicles entirely.
• C. Enzymatic breakdown of bile salts on the enterocyte surface followed by simple diffusion into capillaries.
• D. Continuous passive diffusion of monosaccharides across the apical membrane without involvement of vesicles.

Answer: (A)