Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
WXYZ, YZWX, ABUV, CDST, ?
WXYZ ==> (W+2) (X+2)Â (Y-2) (Z-2) ==>Â YZWX
YZWX ==> (Y+2) (Z+2) (W-2)Â (X-2)Â ==>Â ABUV
ABUV ==> (A+2)Â (B+2)Â (U-2)Â (V-2) ==>Â CDST
CDST ==>Â (C+2) (D+2) (S-2) (T-2) ==> EFQR
So here 'EFQR' will come in place of the question mark.
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