The National Education department says that school safety has set off alarm bells with frequent reports of serious accidents_______students got injured or killed.A that B in which C by which D for whom答案是B'为什么呢'?

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The National Education department says that school safety has set off alarm bells with frequent reports of serious accidents_______students got injured or killed.
A that B in which C by which D for whom
答案是B'为什么呢'?

which作代词指代the accident,in which 作后面句子的地点状语从句