Answer:
c. 2 units of Y.
Explanation:
Country A Country B
Good X Good Y Good X Good Y
90 0 30 0
60 30 20 20
30 60 10 40
0 90 0 60
Country B's opportunity cost to produce 10 units of X is 20 units of Y, therefore the opportunity cost to produce 1 unit of X is 2 units of Y (= 20 / 10 = 2).
Opportunity costs are the extra costs or lost benefits from choosing one activity or investment over another alternative. In this case, if Country B decides to produce 10 units of X, it will lose 20 units of Y.