Trade Contributes to Prosperity Because

Trade contributes to prosperity because:

A) ​every country lacks some vital resources that it can get economically only by trade.
B) ​each country's climate makes it a relatively efficient producer of some goods, and an inefficient producer of other goods.
C) ​each country's labor force makes it a relatively efficient producer of some goods, and an inefficient producer of other goods.
D) ​of all of the above.