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"Since" is normally used when sentence is talking about a time period or an era. Here author is giving different reasons why gold was easily avialable . IMO A is correct
IMO B . i was confused between A and B i.e "has" and "has been" . i think "has been" means something that finished recently and "has" means something finished in past
The greatest road system built in the Americas prior to the arrival of Christopher Columbus 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. Columbu...