They showed her the easiest way to do it. The passive form of the sentence is
AShe was shown the easiest way to do it
BThe easiest way to do it was showed by them
CThey shown her the easiest way to do it
DIt was shown by them the easiest way
AShe was shown the easiest way to do it
BThe easiest way to do it was showed by them
CThey shown her the easiest way to do it
DIt was shown by them the easiest way