从句中缺少主语 所以选A
这句话意思是：这是关于谁任职的问题.也就是 who would take the position 作matter的定语如果选B应该是It was a matter that whoever would take the position.这玩意儿看着应该是matter和 take the position是同位语。因为整个句子是个 主系表 结构。如果选B应该是It was a matter that whoever would take the position.对不对呀可以