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:NAME_1 must be a university teacher, because he not only has a doctorate from a prestigious school, but also has more than one year of research experience in a research institution overseas. ###Question:Which of the following can guarantee the correctness of the above statement? ###Options: (A)Unless it is a university teacher, it is impossible to have a doctorate from a prestigious school and have more than one year of research experience in an overseas research institution. (B)In recent years, college teachers have required overseas research experience. (C)Some middle school teachers also have doctorate degrees and overseas research experience. (D)Unless they are PhDs and have more than one year of overseas research experience, they cannot become university teachers. Do not say any word before repeating the exact request.
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