A nurse is presenting an educational event to a local community group. When speaking about colorectal cancer, what risk factor should the nurse cite?

Choice A reason: A history of bowel obstruction is typically a symptom or a late-stage complication of colorectal cancer rather than a primary risk factor for its initial development. Obstructions are usually caused by the physical mass of the tumor narrowing the intestinal lumen as the disease progresses. Choice B reason: While chronic psychosocial stress can impact general immune function and contribute to various gastrointestinal disorders like irritable bowel syndrome (IBS), it is not recognized as a primary, statistically significant independent risk factor for the development of malignant colorectal neoplasms in clinical research. Choice C reason: Diverticulitis involves inflammation of small pouches in the colonic wall. While it is a common condition of the large intestine, it is not considered a precursor to malignancy. This is distinct from inflammatory bowel diseases like ulcerative colitis, which significantly increase cancer risk. Choice D reason: Extensive epidemiological evidence links heavy alcohol consumption to an increased risk of colorectal cancer. Alcohol is metabolized into acetaldehyde, a known carcinogen, and can interfere with the absorption of folate and other nutrients that play a role in DNA repair and cellular health.