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【单选题】
空气中的氧气在闪电的作用下，部分可转化为臭氧（化学式为O 3 ），下列关于这个变化的说法不正确的是（　　）
A.
臭氧与氧气虽由同种元素组成的但属于不同的物质
B.
臭氧与氧气都属于单质
C.
氧气变为臭氧是物理变化
D.
氧气变为臭氧是化学变化
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