If O is in 4 then J must be in 5, because J has to come right after O. The only other restriction will be that K can’t come before L.
C and E are wrong because they don’t have J in lap 5 – other people are placed there.
A and B are wrong because they don’t place J in lap five.
Often, local rule questions can be quickly solved once you make a single deduction: J must be in five.
D is CORRECT. I’ve shown it by process of elimination, but as further proof, this order works: K-M-L in spots 1, 2 and 3, O-J in spots 4 and 5.
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