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:The people in Harbin are all northerners, and some people in Harbin are not workers. ###Question:If the above proposition is true, then which of the following must be true? ###Options: (A)Some northerners are workers. (C)Some workers are Northerners. (B)Some northerners are not workers. (D)Some workers are not Northerners. Provide your response in exactly 5 paragraphs (separated nearby paragraphs with 3 aterisk symbols ***).
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