Celiac disease is a condition where the body has an abnormal immune response to the protein gluten found in wheat and other grains. A result of this, the body’s immune response can cause damage to the villi. Based on your knowledge of the small intestine, what function would this this most directly affect?

• A. Immune function in the ileum.
• B. Chemical digestion in the duodenum.
• C. Absorption in the jejunum.
• D. Motility in all three regions of the small intestine.