The correct option is B It would have stifled human creativity.
"From the last few lines of the passage, we can gather that the author of the passage would consider the "utopia" referred to in line 60 as a kind of "utopia" that would have suppressed human creativity. This is implied in the sentence, "If Plato's Republic had come true, it would have been a republic with a lot of empty libraries, theaters, and museums if, indeed, those repositories of the arts would have survived at all". Thus B is the best answer."