It was A. Bartering. Coins weren't existent that far back, international trade didn't exist because no one knew about the continents to the west, and it definitly wasn't free trade. Nothing was ever free.
Both the Roman and Han economies were in large part based on agriculture. Sea trade was less expensive than land trade and the fact that Rome was more of a naval empire than the Han Dynasty meant that commerce played a greater role in the Roman economy.
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Answer:
B. force
Explanation:
South Carolina was defying federal law by stating that the tariffs were unenforceable within the state’s borders. Jackson promptly declared nullification illegal and got Congress to pass the Force Act, allowing him to send eight Navy ships and 5,000 soldiers to Charleston. South Carolina, meanwhile, began to raise its own military forces.