The Heian period has already passed, so the first choice seems to me not right because refers to present. Furthermore, no one who lives could have lived in that age. The third one refers to future, and the last one means we had a choice in the past to do it.
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The correct answer was only 2.You want: The only correct answer was 2.
CalifJimSo, while it seems that should have been might be a correct answer, it can only make sense when we take should have been in a much less used sense. That is, we have to interpret it in an unusual way to make sense of it, so it's best to consider it as incorrect for the purposes of this particular question.Ah, ok. I was starting to worry, becuse I