They were reading ( ) the light was out .A.when B.while选A还是B

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They were reading ( ) the light was out .A.when B.while选A还是B?

选A
the light was out 灯熄了,是终止性动词,也叫瞬间动词.
①when意为"在……时刻或时期",它可兼指"时间点"与"时间段",所引导的从句的动词既可以是终止性动词,也可是持续性动词.如：
When I got home,he was having supper.我到家时,他正在吃饭.
When I was young,I liked dancing.我年轻时喜欢跳舞.
②while只指"时间段",不指"时间点",从句的动词只限于持续性动词.如：
While I slept,a thief broke in.在我睡觉时,盗贼闯了进来.
再问：谢谢你的分析，但是你楼下的是这样分析的，我觉得也是有点道理，不知要哪个了，你能再给我分析一下吗？谢谢！是这样的： B。因为when多指一个时间点，而while多指一个时间段。the light was out 是一个时间段，如果是the light went out 则要用when因为那是一个时间点。
再答：首先，按照句子的意思灯灭了，肯定不是指一个时间段。他们正在阅读，这时灯突然灭了。这样理解是对的。如果按时间段来理解就成了：他们正在阅读，灯一直是灭的。不通吧，一直灭的怎么阅读呢？我认为还是按突然灭了，瞬间动词来理解才对。用when 请参考。

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