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.
PRO : NOL :: HEL : ?
PRO ==>Â (P-2) (R-3) (O-3)Â ==> NOL
HEL ==>Â (H-2)Â (E-3)Â (L-3)Â ==> FBI
So 'FBI' will come in place of a question mark.
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