Final answer:
Diabetes is NOT a disease of the digestive system, while Crohn's disease, ulcerative colitis, and diverticulosis are diseases that involve the digestive system.
Step-by-step explanation:
Out of the items listed, B. Diabetes is NOT a disease of the digestive system. Diabetes is a metabolic disorder that affects the body's ability to regulate blood sugar levels, but it does not directly affect the digestive system. The other options mentioned, Crohn's disease, ulcerative colitis, and diverticulosis, are all diseases that involve inflammation or abnormalities in the digestive system.