After Reading the Paragraph Below, Answer the Question(s) That Follow(s)

After reading the paragraph below, answer the question(s) that follow(s) .
Alice has been a cigarette smoker since she was 14. Now 75, she has chronic obstructive pulmonary disease because the chronic exposure to cigarette smoke has damaged and killed many of the epithelial cells lining her lungs.
-What possible therapy would Alice require to maintain sufficient exchange of oxygen and carbon dioxide in her body?

A) to inspire 100% oxygen
B) to drink oxygenated water
C) to have her breathing rate stimulated pharmacologically
D) to permanently reduce her level of activity