Which of the Following Statements About the General Pattern of Trade

Which of the following statements about the general pattern of trade is true?

A) World trade has decreased over the past 100 years as a greater number of countries have sought protec­tionist strategies to protect their labor markets.
B) World trade has increased over the past 100 years due to growing economic interdependence.
C) World trade has leveled off over the past 100 years as a greater number of countries have begun to focus on domestic specialization.
D) World trade has fluctuated significantly over the past 100 years because it is closely linked to international politics.