What is the relative price of one unit of wine expressed in terms of beer in Country B when it is self-sufficient?

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One unit of wine equals three units of beerOne unit of wine equals four and a half units of beerOne unit of wine equals five units of beerOne unit of wine equals six units of beer

Explanation

In a state of autarky, the price of wine relative to beer in Country B is such that one unit of wine costs four and a half units of beer. This means option B correctly represents the relative price.