To improve its economy, China focused on industrializing and increasing manufacturing. To encourage industrialization, the Chinese government has not regulated pollution as strictly as many other countries. What is one consequence of China's rapid industrialization?

A. Many nations refuse to trade with China due to its high rate of pollution.
B. The level of air pollution in many Chinese cities is dangerously unsafe.
C. China has nearly exhausted its natural resource supply.
D. China's agricultural sector has contracted significantly.