C is the best substitute.
(a) is irrelevant. this has nothing whatsoever to do with whether the water will improve performance.
analogy: world-class athletes also turn in record performances without using steroids. this fact clearly doesn't prove that steroids are useless in improving athletic performances.
(b) is irrelevant. not only does it have nothing to do with the ways in which water is absorbed, but the "increase" is not quantified at all.
in fact, ironically, the (very indirect)
...
(a) is irrelevant. this has nothing whatsoever to do with whether the water will improve performance.
analogy: world-class athletes also turn in record performances without using steroids. this fact clearly doesn't prove that steroids are useless in improving athletic performances.
(b) is irrelevant. not only does it have nothing to do with the ways in which water is absorbed, but the "increase" is not quantified at all.
in fact, ironically, the (very indirect)
...
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