After undergoing radiation therapy for a liver tumor, a 39-year- old patient developed an ulcer in his small intestine due to inhibition of the mitotic activity in the cells that regenerate the integumentary epithelium of the small intestine. Name these cells.

• A. Exocrine cells with acidophilic granulation
• B. Endocrine cells
• C. Columnar epithelial cells
• D. Columnar crypt cells without brush border
• E. Exocrine goblet cells