The option that most likely explains why the liberated human would find it difficult to enter the outside world after living in the cave is this:
B. It would be disorienting to experience a different reality than the one he already knew and understood.
In the Allegory of the Cave by Plato, we learn of the different things that the caveman might feel when he leaves the cave. When the liberated human leaves the cave, he will encounter some realities that are quite different from the ones that he was used to in the cave.
For instance, the sharp light that strikes his eyes might irritate and disorientate him. Also, if he was chained, he might at first find it difficult to walk. So, option B describes the possible reaction.
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