Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
TRO, RQM, PPK, NOI, ?
TRO ==>Â (T-2) (R-1) (O-2) ==>Â RQM
RQM ==>Â (R-2) (Q-1) (M-2)Â ==>Â PPK
PPK ==> (P-2) (P-1) (K-2)Â ==>Â NOI
NOI ==>Â (N-2) (O-1) (I-2)Â ==> LNG
Hence 'LNG' will come in place of the question mark.
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