According to the current classification by SAIC ( 国家工商总局 ), the four categories of foreign direct investment in China include ________

6.Which of the following would probably be the most reliable source of testimony in a speech about the impact of automobile exhaust on air pollution? A: The president of SAIC GM(上汽通用）. B: Chinese Research Academy of Environmental Sciences. C: A public relations officer at SAIC Volkswagen(上汽大众). D: Bank of China.