Which of the Following Is True of International Trade

Which of the following is true of international trade?

A) It allows a country to specialize in the production of certain goods and services.
B) It leads to a reduction in the world production of goods and services.
C) It allows a country to move to a lower consumption possibilities frontier.
D) It allows a country's consumption possibilities frontier to lie inside its production possibilities frontier.
E) It makes a country's production possibilities frontier a downward-sloping straight line.