If O is not with P, then our diagram looks like this:
(Scroll down for diagrams + explanation)
H and one of N/S has to go with P, since no one else can.
The other N/S, K, IL and G all go before P.
A is wrong because both O’s class and P’s class come after G. So G is fourth.
B is wrong because H has to go with P.
C is wrong because G, O and P come after IL. So IL is third.
D is CORRECT. N could go with P, and P could go either fifth or sixth, depending on O.
E is wrong because one of N/S goes before K and the other goes with P. S is either first, fifth or sixth.
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