During some types of antibiotic treatments, patients often experience diarrhea because __________.

• A. antibiotics are toxic to the colon's epithelium and to bacteria
• B. antibiotics interfere with the vitamin absorption normally occurring within the large intestine
• C. after intestinal bacteria have been killed, an unusually large amount of water is reabsorbed
• D. antibiotics affect the hormones that control intestinal peristalsis
• E. the microbiome of the large intestine that normally breaks down undigested organic material is killed by the antibiotics