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 decrease their preferences for goods produced in the EU relative to American goods.
C) The European Union increases its quotas on German wristwatches.
D) The price level of goods produced in the EU increases relative to the price level of goods produced in the United States.