The question being tested is whether or not the human body will produce more red blood cells at higher altitudes.
The hypothesis an athlete would create from this question is that the body will produce more red blood cells at a higher altitude to ensure the pumping of oxygen throughout the body.
I believe the correct answer is C. The other answers give outside information that doesn’t correlate with the promoted question.
C. Stroke if I'm not mistaken.
Good luck!
