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 southernChili.
A. Columbus was the Incan highway, which, over 2,500 miles long and extending
-"and extending" = incorrect. ", which" not necessary b/c you're not giving it a verb.
B. Columbus was the Incan highway, over 2,500 miles in length, and extended
- "and extended"
...
A. Columbus was the Incan highway, which, over 2,500 miles long and extending
-"and extending" = incorrect. ", which" not necessary b/c you're not giving it a verb.
B. Columbus was the Incan highway, over 2,500 miles in length, and extended
- "and extended"
...




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