问题：
[单选题]15.某学院抽样调查两个年级学生的乙型肝炎表面抗原，其中甲年级调查35人，阳性人数4人，乙年级调查40人，阳性人数8人。该资料宜选用的统计方法为（）
A、四格表 检验
B、四格表校正 检验
C、t检验
D、u检验
参考答案：
A
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