she asked me ________this morning
what was the matter what wrong was
那个，能是下面的吗，what the matter was

这是一个“间接主语疑问句”，先看下面举个间接疑问句的例子：
直接陈述句：i am going home.
直接疑问句：where are you going? (Wh_ + 倒装）
间接疑问句：he asked me where i was going.（Wh_ + 主语 + 动词）

现在看“间接主语疑问句”
先要知道什么叫"主语疑问句":主语疑问句通常询问主语本身,这种疑问句没有倒装.(不给你举例子了,如果你找不到这方面的语法,我在给你解释)

直接主语疑问句who is in charge here?
变成间接主语疑问句 he asked me who was in charge there.（注意疑问词做主语
语时的词序）
what caused the accident? he asked me what caused the accident.
间接主语疑问句的时态和情态动词都照常有变化，但是直接主语疑问句的词序在间接主语疑问句里保持不变。
所以选what was the matter