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(B) That educators have not anticipated the impact of microcomputer technology can hardly be said to be at fault
B的正常语序应该是加入it形式主语，就变成了it can hardly be said that educators have not anticipated the impact of microcomputer technology to be at fault.
这样的话，这个句子其实并不是一个完整句，to be at fault部分应该改为is their fault，填补进去谓语动词这个才是完整的句子
从Topway上摘的，非原创。

个人认为，就是先把that的倒装句变成正装，正常语序下更好找主谓宾等句子结构，便于发现问题。