I believe the answer you are looking for is C.
First, because you need to be careful of what you are eating and should not eat.
Second, if you don't care about what you eating it could be really dangerous.
Answer:
All of the above.
Explanation:
There isn't a need for this, it just is.
Cystic fibrosis - causes a mucus build up on the lungs, that coats the breathing tubes
