The nurse is caring for a client with emphysema. When the nurse enters the client's room, the spouse asks for the oxygen to be increased because the client is having trouble breathing. The nurse's best intervention is to:

a. Call the physician for an order to increase the oxygen delivered.
b. Increase the oxygen and monitor oxygen saturation.
c. Explain that increased oxygen will decrease respirations and make him more short of breath.
d. Tell the spouse that increasing oxygen is not possible.