schooling

timing = 9:39. https://youtu.be/iG9CE55wbtY?t=579. next first sentences is the sentence in one of TED talk. If you were to visit education as an alien and say what's it for public education. If you were to visit education as an alien and say what's for public education. If you were to visit education as an alien and say for what's public education. It might be very strange/impolite for language learner/chick to say that I suppose "it" in the first sentence might be unnecessary and these three sentence means the same. please teach me. is the first sentence the most natural in these sentences?