KL 15 is related to NO 21 in a certain way. In the same way, XY 28 is related to AB 34. Which of the following is related to GH 41 by using the same logic?

Use letter positions: $A = 1, B = 2, \ldots, Z = 26$.

KL $\to$ NO: $K(11) + 3 = N(14)$ and $L(12) + 3 = O(15)$

$15 \to 21$: $15 + 6 = 21$

So each letter moves $3$ places forward and the number increases by $6$.

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Checking with XY $28$:

$X + 3 = A$ and $Y + 3 = B$ (after $Z$, counting restarts from $A$: $X \to Y \to Z \to A$)

$28 + 6 = 34$

This gives AB $34$, so the rule is correct.

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Applying it to GH $41$:

$G(7) + 3 = J(10)$

$H(8) + 3 = K(11)$

$41 + 6 = 47$

Therefore, GH $41$ is related to JK $47$.