Select the letter-cluster that can replace the question mark (?) in the followingseries.
AR, CP, ?, GL, IJ, KH
(A + 2)(R - 2) = CP
(C + 2)(P - 2) = EN
(E + 2)(N - 2) = GL
(G + 2)(L - 2) = IJ
(I + 2)(J - 2) = KH
$$\therefore$$ The correct answer is option C.
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