Think about who we have to pin down. We need to know who lectures about one of either M and N, one of the pair K and L, and we also need to know who 5 lectures on.
Answer C lets us do that. C is CORRECT. If we know when M is lectured about (for example, on day 3) then we know N must be lectured about on the other day (day 4.)
If we know where half of a pair goes, then we can also say where the other half goes.
This type of question can take a long time, without the right method. So before wading through the answers on this type of question, ask yourself which variables you need to pin down.
A and B don’t let us choose between O and P.
D and E don’t let us know when to place K and L.
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