Select the letter-cluster that can replace the question mark (?) in the followingseries.
AOS, CQU, ? , GUY, IWA
The series follows as pattern,
(A + 2)(OÂ + 2)(S + 2) = CQU
(C + 2)(Q + 2)(U + 2) = ESW
(E + 2)(S + 2)(W + 2) = GUY
(G + 2)(U + 2)(Y + 2) = IWA
$$\therefore$$ The correct answer is option A.
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