In the Context of International Trade, Which of the Following

In the context of international trade, which of the following statements is true of comparative advantage?

A) It is the tendency of a country to choose goods that have a higher opportunity cost compared to other countries.
B) As technology changes, nations may gain or lose comparative advantage in various industries.
C) It is subjected to the industries in developing countries facing major trade barriers.
D) Despite evolving workforces, developing countries maintain a static comparative advantage.