Wow is this really a gmat prep Q, never saw a question with one boldface.

I got stumped and went for D. Let the experts come on this one.

or refer this post bro

https://www.beatthegmat.com/super-oxy-t30277.html

Nice question , IMO C. I m no expert but below mentioned is my take on the question and hope that it helps.

The boldface of the argument infers that the superOXY water is not useful as the blood already has more oxygen than the muscle can absorb. So we need to find an answer that is on similar line of reasoning and which evidently states that superOXY is of no use.

A] Irrelevant
B] No way states that superOXY is of no use , not even near.
C] States that oxgen cannot be absorbed directly from blood and hence consuming oxygen rich water is of no use .
D] This option is somehow with [supporting] the argument .
E] The issue is not just about water but about oxygen.

Thanks & Regards,
AIM GMAT

Thanks AIM GMAT, at first I did not understand how it could be C. I guess I did not recognize the reasoning behind the boldface.
To: Experts. Is this right?

Well AIM GMAT I think maybe you are an expert since you are right on...nice explanation.

Last time I took the official GMAT I did see a question just like this one -- with one bold statement that asked me to replace the bold portion with an answer choice that served the same function. So it does happen!

When you see that only one statement is bold, you want to decide what function the bold statement plays. Then you have to find the answer choice that does the same.

We discussed the question a few months ago because there is more than one version out there. For this version, the OA is C. There is another version with the same setup but a different statement in bold and for that one the answer is B. If you have seen the other version please see my comment here https://www.beatthegmat.com/useless-bott ... 66646.html.

David@VeritasPrep wrote:Well AIM GMAT I think maybe you are an expert since you are right on...nice explanation.

Last time I took the official GMAT I did see a question just like this one -- with one bold statement that asked me to replace the bold portion with an answer choice that served the same function. So it does happen!

When you see that only one statement is bold, you want to decide what function the bold statement plays. Then you have to find the answer choice that does the same.

We discussed the question a few months ago because there is more than one version out there. For this version, the OA is C. There is another version with the same setup but a different statement in bold and for that one the answer is B. If you have seen the other version please see my comment here https://www.beatthegmat.com/useless-bott ... 66646.html.

The GMATPrep questions are simply awesome...

Here is the same question with the bold parts changed...

One of the limiting factors in human physical performance is the amount of oxygen that is absorbed by the muscles from the bloodstream. Accordingly, entrepreneurs have begun selling at gymnasiums and health clubs bottles of drinking water, labeled "SuperOXY," that has extra oxygen dissolved in the water. Such water would be useless in improving physical performance, however, since the only way to get oxygen into the bloodstream so that it can be absorbed bye the muscles is through the lungs.
Which of the following, if true, would serve the same function in the argument as the statement in boldface?
A. the water lost in exercising can be replaced with ordinary tap water
B. the amount of oxygen in the blood of people who are exercising is already more than the muscle can absorb
C. world-class athletes turn in record performance without such water
D. frequent physical exercise increases the body's ability to take in and use oxygen
E. lack of oxygen is not the only factor limiting human physical performance

This type was new to me and good to know this one before the actual exam...
Irrespective of question... the part in bold is evidence used to support the conclusion that 'Such water would be useless in improving physical performance.' So, the question is really asking us to find one more evidence that if true would also act as a strengthener supporting the conclusion..
So, we are looking forward for the question that supports the conclusion..

A: Irrelevant as we are not concerned with the lost water in exercise.. We are looking for the water that will be helpful in physical performance...
B: Correct for this question. If the muscles cannot absorb more than what bloodstream currently contains, then there is no need to have more oxygen in the bloodstream.
C: This choice focuses on only on athletes. Also irrelevant..
D: This does not show how SuperOXY wont be of any help..
E: This statement says same thing as what is said by the stimulus that lack of oxygen is not the only factor limmiting human physical performance... And stimulus says one of the limiting factors in human physical performance......
Since, we are looking for some new information not already stated in the passage, a situation demanded by strengthen question, this option cannot be correct.

And hence option B is correct for the question posted in this post !!