问题：
[单选题]有“220V、100W”、“220V、25W”白炽灯两盏,串联后接入220V交流电源,其亮度情况是( )。
A、100W灯泡最亮
B、25W灯泡最亮
C、两只灯泡一样亮
D、无法确定
参考答案：
B
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