There is only one thing you know about N, O, and P: two of them have to be in the morning.
When a question introduces a local rule, you can assume it has an impact on the main diagram.
Here, P is shown in the afternoon. That means that only N and O are left to go in the morning. They both must go in the morning.
E is CORRECT.
Here’s a diagram of the local rule. Note that NO are interchangeable:

P, K-L must be in the afternoon. M and J must be in the evening, since M goes after K – L.
Apart from that, the order doesn’t matter.
A is wrong because M can always be shown 7th.
B is wrong because P could be shown 3rd, before K.
C is wrong because O could be shown first instead. O and N are reversible for this question.
D is wrong because M has to be shown in the evening. P, and K – L fill the afternoon.

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