A is wrong because J can’t go in lap 9. Laps 4 and 9 are the same.
B could be true. The following order proves it: MOJLK. B is CORRECT.
For C, L can’t be in 5 because there’s no place to fit M-O-J without placing K right in front of L. If you put M-O-J in 1, 2, 3, you would get MOJKL.
And OJ can’t go in 3 and 4, because J can’t go in 4.
D is wrong because M has to go before O.
E is wrong because if O is in 6 then O is also in 1. That doesn’t work because M has to go before O.
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