Patients 2 and 5. I hope I helped in some sort of way! :)
Answer:
Oxygen
Explanation:
All cells need oxygen in order to operate properly. If Her respitory system isnt working correctly, her cells will start to not work which can lead to multiple issues such as shortness of breath, fatigue, muscle fatigue, brain fog, etc in short term. Long term/ more serious issues could be a collapsed lung, confusion, fainting, kindey failure, sever muscle weakness, etc.
I think it is D. Ask the doctor what the writing says. If that's wrong, then it's C.