We solved this in the setup. O can’t go on Thursday, because O must go before H. Since H can’t go Friday, the earliest O can go is Wednesday:
C is CORRECT.
You can eliminate the other answers because they have no restrictions on them. N and S can go anywhere (as long as they aren’t beside each other). P can literally go anywhere. H can go anywhere except Friday.
There will never be any “hidden rules” blocking a variable from going somewhere not mentioned as being forbidden in the setup. (Except through a fairly direct deduction like we made for O.)
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