This question requires what the underlying portion is doing, and then choose an option that does the same. On re-read the bold argument is providing a reason suggesting why more oxygen is of no help. The same is convyed in C, the credited response, where it says that only way to absorb oxygen is through LUNGS, and are allowedto use this outside knowledge that drinking and LUNG are two different thing, if oxygen is only absorbed through LUNGS drinking will not help
WHy D is not a correct option, because, it only says there can be other ways to improve performance, since the argument is about oxygen, it doesn't help negate that oxyrich is of no help.
Charged up again to beat the beast
