Answer:
c. potatoes
Step-by-step explanation:
The computation is shown below:
Opportunity cost of producing 1 tons of wheat is
for US = 4 ÷ 3 = 1.33 tons of potatoes
for Ireland = 2 ÷ 1 = 2 tons of potatoes
As the opportunity cost is higher in united states of potatoes so here the united stated should be comparative advantage in generating potatoes