Number the positions (1-based) in the given arrangement. The positions of the three characters in each option are:
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E9J → E(11), 9(13), J(10) → steps = |13−11| = 2 and |10−13| = 3
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Z1U → Z(16), 1(18), U(15) → steps = 2 and 3
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HW4 → H(21), W(19), 4(22) → steps = 2 and 3
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Y48 → Y(24), 4(22), 8(25) → steps = 2 and 3
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B2K → B(6), 2(8), K(4) → steps = |8−6| = 2 and |4−8| = 4
Four options have successive position differences 2 and 3 (in some order). B2K is the only one with differences 2 and 4, so it does not belong.