If $S+T$ means $S$ is the father of $T$; $S-T$ means $S$ is the sister of $T$; $S\%T$ means $S$ is the mother of $T$ and $S\times T$ means $S$ is the brother of $T$, which of the following shows that $J$ is the paternal aunt of $K$?

For $J$ to be the paternal aunt of $K$, $J$ must be the sister of $K$ 's father. Let's analyze option A ($J-L+M\times K$):
1. $J-L\to J$ is the sister of $L$ (so $J$ is female).
2. $L+M\to L$ is the father of $M$.
3. $M\times K\to M$ is the brother of $K$.

Since $M$ and $K$ are siblings sharing the same father $L$, $L$ is also the father of $K$.
Since $J$ is the sister of $L$, $J$ is the sister of $K$ 's father.
Therefore, $J$ is the paternal aunt of $K$.