I want to know whether it was ______ that caused the failure

I want to know whether it was ______ that caused the failure of the project.
A his carelessness B he was so careless C because he was so careless D because of his carelessness 为什么是第四个答案是第四个为什么不能是第一个当成强调句为什么不行

绝世丑gay程青松 1年前已收到1个回答举报

王傲幼苗

共回答了18个问题采纳率：88.9% 举报

A his carelessness
因为被强调部分是原句的主语（名词词组）,不是原因状语

1年前追问

绝世丑gay程青松举报

请在详细点解释我不太明白谢谢

举报王傲

还原你就看出来了。【His carelessness主语】 caused the failure of the project 如果你选第四个，你看：【Because of his carelessness 这是介词短语，能做主语吗？！】 caused the failure of the project

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你能帮帮他们吗

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