I think it all depends on what school you go to
A free-trade zone is by definition “a place where trade is left to happen without tariffs(tax on imports/exports), quotas, or other restrictions”. An example of a free-trade zone is the European Union. There are no tariffs, quotas, or other restrictions placed on trading within the EU countries (they even share a currency). This allows for them to place products at a cheaper price for good quality and still get enough money to grow wealth within the different countries.
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The answer is letter d, the authority gives a state the right to use its power. It is because this can explain the relationship of power and authority where in it happens in today's modern world of which an individual can use their power when they have the authority or right to do so
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