Assuming a Competitive World, Does Your Country Have a Comparative

Assuming a competitive world, does your country have a comparative advantage in making pizza? You can get your answer by

A) observing if your country makes more pizza than any other country
B) comparing pizza prices in other countries
C) calculating the opportunity cost of a pizza in your country
D) comparing the opportunity cost of producing pizza in your country with the opportunity cost of producing pizza in other countries
E) comparing your country's terms of trade to the terms of trade in other countries