Select the option that is related to the third letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster.
ROM : SRT :: PNA : ?
ROM ==> (R+1) (O+3) (M+7)Â ==>Â SRT
PNA ==>Â (P+1) (N+3) (A+7)Â ==> QQH
Hence 'QQH' will come in place of the question mark.
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