A and B are wrong because neither K nor L can go in the evening. K and L have to go before M. There’s only space for J and M in the evening.
C is CORRECT. P is a random variable, so there is no reason it can’t be shown after J. Here’s a diagram that shows one way it could work:
D and E may seem tempting, because they use random variables. The problem is that they each use two random variables.
We saw in the setup that N, O and P are the only houses that can be shown in the morning. So two of them must be shown in the morning.
So two of these variables can’t go after M or after K, because then there would only be one left to go in the morning.
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