If a Country's Opportunity Costs Increase When It Trades One

If a country's opportunity costs increase when it trades one product for another,

A) the country will stop trading in that product.
B) the country will have a linear production possibilities curve.
C) complete specialization can still occur but only in the product in which the country does not have a comparative advantage.
D) the country will specialize completely in the product in which it has a comparative advantage.
E) complete specialization does not occur.