参考答案

正确答案：D
解析：此题从选项中可推断问题可能与人的身份有关。首先可排除C，因为听到的内容是"25-year-old"。此题问题是"Who was the killer?"。根据所听到的"The killer was 25-year-old Mark Chapman …"以及"Chapman was a fan of the Beatles and Lennon"。可推断出D为正确选项。