A nurse is teaching a client who has chronic pain about avoiding constipation from opioid medications. Which of the following information should the nurse include in the teaching?

Rationale: A. Fiber intake, particularly insoluble fiber (from whole grains, vegetables, and fruits), should be increased, not decreased, to promote bowel regularity. B. Physical activity enhances bowel motility and is one of the most effective nonpharmacologic measures to prevent opioid-induced constipation. Alongside hydration and fiber intake, regular exercise helps maintain normal bowel function. C. Fluid intake of at least 2 to 3 liters per day is recommended to soften stool and prevent constipation. 1.5 L is insufficient for most adults, especially those on opioids. D. Mineral oil is not recommended because it can interfere with the absorption of fat-soluble vitamins (A, D, E, and K) and poses an aspiration risk, especially in older adults.