I picked option E but have a query on option B.
Option B as mentioned contains bad parallelism,
Omitting over 2,500 miles in length as a non-essesntial modifier, sentence B stands as The greatest road system built in the Americas prior to the arrival of Christopher Columbus was the Incan highway and extended from northern Ecuador through Peru to southern Chile.
So, is extended here a modifier or a verb. On side of the sentence before and we have a clause, so the other side should also contain
...
Option B as mentioned contains bad parallelism,
Omitting over 2,500 miles in length as a non-essesntial modifier, sentence B stands as The greatest road system built in the Americas prior to the arrival of Christopher Columbus was the Incan highway and extended from northern Ecuador through Peru to southern Chile.
So, is extended here a modifier or a verb. On side of the sentence before and we have a clause, so the other side should also contain
...
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