如图所示，开关S闭合时，小灯泡L1、L2都不亮，用一段导线的

如图所示，开关S闭合时，小灯泡L ₁、L ₂都不亮，用一段导线的两端接触a、b两点时，两小灯泡都不亮；接触b、c两点时，两小灯泡也不亮；接触c、d两点时，两小灯泡都亮。对此，下列判断中可能的是（　　）

A．	小灯泡L ₁断路	B．	小灯泡L ₂断路
C．	开关S断路	D．	小灯泡L ₂短路

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