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【单选题】
以下是国家关于空气污染指数与质量级别、质量状况的对应关系表 污染指数 50以下 51-100 101-200 201-250 251-300 300以上 质量级别 Ⅰ Ⅱ Ⅲ Ⅳ（1） Ⅳ（2） Ⅴ 质量状况 好 良好 轻度污染 中度污染 中度重污染 重度污染 我市2011年3月12日的空气污染指数为56～76，根据上表的信息判断我市当天的空气质量级别和空气质量状况分别为（ ）A.
Ⅰ级 好
B.
Ⅱ级 良好
C.
Ⅲ级 轻度污染
D.
V级 重度污染
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