Final answer:
To prevent constipation in an adult client on bed rest, whole-grain cereal is the best option because it is high in fiber which promotes bowel movements.
Step-by-step explanation:
To prevent constipation in an adult older client who is on bed rest, it is important to include foods high in fiber in their diet. Among the choices provided, d) Whole-grain cereal is the best option. Whole-grain cereals are part of healthy eating guidelines which recommend making at least half of daily grain choices whole grains. Whole grains are high in dietary fiber, which helps to promote bowel movements and prevent constipation. Foods like white bread and processed cheese are typically low in fiber, while apple juice lacks the fiber found in whole apples.