Figure 30-1 -Refer to Figure 30-1. Which of the Following Would Cause

Figure 30-1
-Refer to Figure 30-1. Which of the following would cause the change depicted in the figure above?

A) European productivity rises relative to American productivity.
B) Americans increase their preferences for goods produced in the EU relative to American goods.
C) The U.S. removes a quota on wristwatches from the European Union.
D) The price level of goods produced in the EU increases relative to the price level of goods produced in the United States.