Which of the Following Was Being Determined by the Research

Which of the following was being determined by the research that led to the development of the theory of national competitive advantage?

A) How government intervention and trade policies affect international trade
B) How economies of scale impact the variety of goods and scale of production
C) How technological advances impact first mover advantages
D) Why some countries succeed and others fail in international competition
E) How trade increases the variety of goods and decrease the cost of these goods