On this question it makes sense to depart from the setup scenarios and build a new diagram based on the rules.
If J is on Thursday afternoon, then we know O is on Friday. J comes before O (rule 3).
In fact, ON are on Friday, because KR go together (rule 1) and only Wednesday has space to take both of them:
O is in the morning, because N can only go in the afternoon.
Finally, L must fill Thursday morning.
We can tell where L, O and N are placed, in addition to J. So C is CORRECT.
KR can go in either order.
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