Answer:
D. the two countries wish to take advantage of the principle of comparative advantage.
Step-by-step explanation:
This is true because, when the comparative advantage that exist between two countries in production process is high, it leads to business trade relation. For example, country A has the comparative advantage of producing milk more than country B while country B has the advantage of producing egg than country A. Because both countries needs what the other produces, it would lead to trade between them.