If the opportunity cost of producing wheat in Canada is four buffaloes and the opportunity cost of producing wheat in the U.S. is seven sheep then we know that

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EThe information given does not provide a direct comparison between the opportunity costs of producing wheat in terms of a common unit (buffaloes and sheep are not directly comparable without more information), so we cannot determine specific trade ratios or make other specific conclusions about trade (C). However, since the opportunity cost of producing wheat is lower in Canada (four buffaloes) than in the U.S. (seven sheep), according to the principle of comparative advantage, Canada should specialize in producing wheat (E).

If the Opportunity Cost of Producing Wheat in Canada Is