Which term refers to one country's ability to produce a certain product at a lower cost or using fewer resources than it can produce another product, compared to another country's production of those same products A. comparable productivity
B. outsourcing
C. absolute advantage
D. comparative advantage

comparative advantage

Explanation:

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first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.