Final answer:
The nurse will raise the head of the bed to 45 degrees to place the patient in the prone position.
Step-by-step explanation:
The nurse will take the action of raising the head of the bed to 45 degrees when placing the patient in the prone position. Placing a pillow under the patient's abdomen or turning the head to one side with a large, soft pillow are not appropriate actions for placing a patient in the prone position. Positioning the legs flat against the bed is also not the correct action.