已知某两种物质在光照条件下能发生化学反应,其微观示意图如下:

已知某两种物质在光照条件下能发生化学反应,其微观示意图如下:           

(说明:一种小球代表一种原子)

则下列说法正确的是

    A.图示中的反应物都是单质            B.图示中共有4种分子

C.该反应属于置换反应                D.该图示不符合质量守恒定律

答案

B

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