GMAT Sentence Correction (SC) | The greatest road system built in the Americas prior to the

The greatest road system built in the Americas prior to the arrival of ChristopherColumbus was the Incan highway, which, over 2,500 miles long and extending from northern Ecuador through Peru to Southern Chile.

A. Columbus was the Incan highway, which, over 2,500 miles long and extending

B. Columbus was the Incan highway, over 2,500 miles in length, and extended

C. Columbus, the Incan highway, which was over 2,500 miles in length and extended

D. Columbus, the Incan highway, being over 2,500