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

The Anasazi settlements at Chaco Canyon were built on a spectacularscale with more than 75 carefully engineered structures, of up to 600 rooms each, were connected by a complex regional system of roads.

A. scale with more than 75 carefully engineered structures, of up to 600 rooms each, were
B. scale with more than 75 carefully engineered structures, of up to 600 rooms each,
C. scale of more than 75 carefully engineered structures of up to 600 rooms, each that had been
D. scale of more than