题目内容

有红、蓝、黄、白、紫五种颜色的皮球，分别装在五个盒子里，甲、乙、丙、丁、戊五人猜测盒子里皮球的颜色。甲：第二盒是紫的，第三盒是黄的。乙：第二盒是蓝的，第四盒是红的。丙：第一盒是红的，第五盒是白的。丁：第三盒是蓝的，第四盒是白的。戊：第二盒是黄的，第五盒是紫的。猜完之后打开盒子发现，每人都只猜对了一种，并且每盒都有一个人猜对。如果上述断定都为真，以下哪项也一定是真的（）

A. 第一个盒子内的皮球是蓝色的。
B. 第三个盒子内的皮球不是黄色的。
C. 第二个盒子内的皮球是白色的。
D. 第五个盒子内的皮球是红色的。
E. 第四个盒子内的皮球是白色的。

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