Analyze positional differences

Assign numerical values (A=1, B=2... Z=26) and find the absolute difference between the letters in each cluster: A) EX (5, 24) diff=19; OK (15, 11) diff=4. Wait, check internal difference: E(5) to X(24) = 19; O(15) to K(11) = 4. Let's look at cluster differences: EX(5, 24), OK(15, 11). Correct approach: Difference between letters within each cluster. A: E(5) to X(24) = 19; O(15) to K(11) = 4. Let's check difference of first and second cluster: EX-OK: E → O (+10), X → K (-13). This is not it. Let's check: E(5)+O(15)=20, X(24)+K(11)=35. Still not clear.

Evaluate constant difference pattern

Re-evaluating: A) E(5), X(24) | O(15), K(11). Difference E-X = 19, O-K = 4. This is not it. Let's look at: EX(5, 24) sum=29; OK(15, 11) sum=26. B) Z(26), S(19) diff=7; J(10), F(6) diff=4. C) I(9), B(2) diff=7; P(16), O(15) diff=1. D) M(13), F(6) diff=7; W(23), S(19) diff=4. Wait, the pattern is: Option A: 24-5 = 19, 15-11 = 4. Option B: 26-19 = 7, 10-6 = 4. Option C: 9-2 = 7, 16-15 = 1. Option D: 13-6 = 7, 23-19 = 4.

Final pattern identification

Looking at the differences again: B is (7, 4), D is (7, 4). A is (19, 4). C is (7, 1). Actually, in pairs B and D, the first cluster has a difference of 7 and the second has a difference of 4. Pair C has a difference of 7 and 1. Pair A has 19 and 4. Let's re-verify the alphabet indices: A: E(5), X(24), O(15), K(11). B: Z(26), S(19), J(10), F(6). C: I(9), B(2), P(16), O(15). D: M(13), F(6), W(23), S(19). Pattern: In B and D, first cluster difference is 7, second cluster difference is 4. In C, first is 7, second is 1. In A, first is 19, second is 4. The common logic found in B and D is consistent.