Sentence Correction

The Anasazi settlements at Chaco Canyon were built on a spectacular scale, with more than 75 carefully engineered structures, of up to 600 rooms each, were connected by 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 75 carefully engineered structures of up to 600 rooms and with each

E) scale of more than 75 carefully engineered structures of up to 600 rooms, each had been

OAB

Hi Experts ,

Please explain each options.

Also please explain COMMA+WITH in OA