This question places H on Wednesday. When a question gives you a new rule, you should draw it, and then look at the existing rules to see which are affected.
We see L can only go Wednesday. That means L is out on this question. And since there are only six variables, that means all the other 5 must go in.
So, since O is before H, that means O is before H:
Because Oldtown must be on Tuesday, B is CORRECT.
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