
Passage: Since 1997, Hong Kong has fallen into a relatively serious economic recession. In this year, Hong Kong began to implement "one country, two systems" policy. Some people claim that it is "one country, two systems" that caused Hong Kong's economic recession.
Question: Which of the following options is most relevant for refuting the above?
A. A.If two things happen at the same time or successively, can we determine that there is a causal relationship between them?
B. B.Why did Taiwan, Singapore, South Korea and the United States also experience economic recession during this period?
C. C.What Chinese mainland economy is booming?
D. D.Why did Britain, which used to control Hong Kong, also had a bad economic situation during this period?
Answer: