GMAT Sentence Correction (SC) | Re: The Anasazi settlements at Chaco Canyon were built on a

Dearvad3tha ,
I'm happy to respond. First of all, the OAis posted for this question already. When you seethis:

the gray spoiler bar at the bottom of a question at the head of a post: that's precisely where the OA is. You simply click on "[Reveal] quot; and you can view the OA.

Now, why is(C) incorrect? Well, first of all, the word "of
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