Concept:Each letter in the first word is shifted by a specific number of positions forward in the alphabet to get the corresponding letter in the second word.Explanation:In CAB to EDC: C (3rd letter) + 2 = E (5th); A (1st) + 3 = D (4th); B (2nd) + 1 = C (3rd).Apply the same shifts to ONM: O (15th) + 2 = Q (17th); N (14th) + 3 = Q (17th); M (13th) + 1 = N (14th).Thus, ONM becomes QQN.