Answer:
a. 9 pairs of jeans per pane of stained glass.
d. 8 pairs of jeans per pane of stained glass.
Explanation:
Greece and Austria both produce jeans and stained glass. Greece opportunity cost is 5 pairs of jeans per stained glass and Austria opportunity cost 10 pairs jeans per stained glass. Greece has comparative advantage in producing stained glass whereas Austria has comparative advantage in producing Jeans.
If these both countries agree to trade with each other, the trade would be beneficial if Greece receives more than 5 pairs of jeans per pane of stained glass. If the trade took place at more than 5 pairs of jeans for per pane of stained glass it will be beneficial for both countries. Option a and option d has more than 5 pairs of jeans. Option b has 3 pairs of jeans so the trade is not beneficial for either countries and option c has 1 pair of jeans per pane of stained glass which also a trade not suitable to both countries.