【单选题】
下列关于口岸食品销售单位开展口岸食品卫生监督量化分级管理的表述，错误的是________。
A. 对A级单位监督频次每6个月不少于1次
B. 对B级单位监督频次每3个月不少于1次
C. 对未开展量化分级管理的单位监督频次每2个月不少于1次
D. 对C级单位监督频次每个月不少于2次
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D
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