Figure 30-2 -Refer to Figure 30-2. Which of the Following Would Cause

Figure 30-2
-Refer to Figure 30-2. Which of the following would cause the change depicted in the figure above?

A) Lack of investment in infrastructure causes U.S. productivity to fall relative to Chinese productivity.
B) Tainted cat food from China causes U.S. consumers to decrease their preferences for Chinese goods relative to U.S. goods.
C) A new trade agreement with China results in the United States removing all tariffs on clothing imported from China.
D) The Chinese increase their preferences for goods produced in the United States.