Country A can produce 10 tons of wheat or 5 tons of steel using the same amount of resources. Country B can produce 6 tons of wheat or 4 tons of steel with the same resources. According to the principle of comparative advantage, which of the following is true?
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A
Country A should specialize in steel, and Country B in wheat.
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B
Country A has an absolute advantage in both goods and should not trade.
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C
Country B has a comparative advantage in producing steel.
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D
Country A has a comparative advantage in producing steel.