Please answer the question based on the following passage. You need to choose one letter from the given options, A, B, C, or D, as the final answer, and provide an explanation for your choice. Your output format should be ###Answer: [your answer] ###Explanation: [your explanation]. ###Passage:Since 1997, Hong Kong has fallen into a severe economic recession; it was this year that Hong Kong began to implement "one country, two systems." Some claim that "one country, two systems" caused Hong Kong's economic recession. ###Question:Which of the following questions is most relevant for refuting the above reasoning? ###Options: (A)If two things happen at the same time or one after another, can we be sure that there is a causal relationship between them? (B)Why did Taiwan, Singapore, South Korea, and the United States also experience economic recession during this period? (C)Why the economy of mainland China is booming. (D)Why was the economic situation of the United Kingdom, which used to regulate Hong Kong, bad during this period?