There are two possible scenarios if R is in a single. We could put S, T and V in a triple together, or we could split them into doubles with L. S, T and V can only be in doubles or a triple.
There are no more scenarios. We need to find something that could be true.
A can’t be true. We either have two doubles with second years, or no doubles with second years.
B could be true, in the first scenario. B is CORRECT.
C can’t be true: K and P always have to be in a double, not a triple.
D can’t be true: we either have two singles or one single.
E can’t be true: we either have one double or three.
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