Final answer:
The nurse questions the PRN order for acetaminophen because the patient is not experiencing pain with the skin infection.
Step-by-step explanation:
Out of the given options, the nurse questions the PRN order for acetaminophen because the patient is not experiencing pain with the skin infection. PRN stands for 'as needed', which means the medication is given based on the patient's symptoms. Since the patient is not in pain, there is no need for the administration of acetaminophen.