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【单选题】
某无色混合气体中可能含有Cl 2 、O 2 、SO 2 、NO、NO 2 中的两种或多种气体．现将此混合气体通过品红溶液后，品红溶液褪色，把剩余气体排入空气中，很快变为红棕色．对于原混合气体成分的判断中正确的是（　　）
A.
可能有Cl 2 和O 2
B.
可能有SO 2 、O 2 和NO
C.
肯定有SO 2 和NO
D.
NO 2 和SO 2 至少有一种，肯定有NO
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