Answer: The answer is c 2 barrel of beer per pane of stained glass
Step-by-step explanation:
Since the theory of opportunity cost states that,to have a comparative advantage in a commodity, the opportunity cost of that country must be low.
Therefore the price of stained glass in terms of beer that would allow both Germany and Italy to gain from trade is
Opportunity cost = 11 /5
=2.2
Therefore the correct option is 2 barrel of beer per pane of stained glass