Imagine that you work for Boeing, building airplanes. Each plane from your production line embodies some of your labor, so every time one of these planes is exported to China, this means that _____.
A. laborers in the United States and China directly compete with each other
B. China's exported goods embody the labor of workers from the United States
C. you are selling some of your labor to China
D. laborers in the United States and China compete in the same national labor market