GMAT Sentence Correction (SC) | Re: Building large new hospitals in the bistate area would

http://www.beatthegmat.com/1000-sc-q184-t14007.html

Sentence core:
Building X would constitute a wasteful use of Y, (modifier).

Meaning:
Building X would be wasteful, at the very least because of one particular reason. (It's not the only reason, but it's a large enough reason that it is sufficient all by itself as a reason not to build.

C changes the meaning - it indicates that the duplicated facilities thing is the ONLY reason why it would be wasteful, but that's not the
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