The author mentions "sight unseen" primarily in order to emphasize that Shor's method
A． does not allow for the cloning of a bit of quantum information that has not first been recognized B． tends to be less reliable than classical information correction, because it is impossible to discern whether Shor's is successful C． has been accepted by physicists without much skeptical investigation D． allows for a quantum correction where the individual states of quantum bits do not need to be reported. E． quantum correction circuits tend to operate at random