Final answer:
Administering an oxygen mask is the nursing intervention that helps ensure a patient receives 35% oxygen.
Step-by-step explanation:
The nursing intervention that helps to ensure that a patient receives 35% oxygen is a. Administering an oxygen mask. Administering an oxygen mask delivers a specific flow rate of oxygen directly to the patient's airway, allowing them to inhale the desired concentration of oxygen. Adjusting the flow rate of an oxygen concentrator (option b) would not be effective in ensuring a specific percentage of oxygen because it depends on the patient's oxygen requirement and the device's maximum capacity.
Monitoring oxygen saturation with a pulse oximeter (option c) provides information about the patient's oxygen levels but does not guarantee a specific percentage of oxygen being delivered. Confirming the oxygen prescription with the healthcare provider (option d) is important for overall patient safety, but it does not directly address the specific percentage of oxygen being delivered.