A) they allow an athlete to exercise longer
(i just took the quiz)
Many things can cause shortness of breath, but the most common are asthma, pneumonia, bronchitis, lung cancer, anxiety, an allergic reaction, a lung injury, obesity, heart dysfunction, COPD and many many more things.
As for treating this, see your physician. Hope I helped you!
The suffix ist means one who, that which.
The answer is D pulse oximeter
hope this helps
