2. A 76-year-old man complains of frequent small stools that are not abnormally liquid or hard. There is some pain with passing the stool. He has no abdominal pain, nausea, melena, vomiting, or fever. He has approximately eight to ten bowel movements per day, which interferes with his quality of life, though there is no fecal incontinence. What is a possible diagnosis to explain his complaints? A. Hypothyroidism B. Neuromuscular disorder C. Proctitis D. Ulcerative colitis E. Viral gastroenteritis Give rubrics for the choice given.