Concept:Each letter of the second group is obtained by moving each letter of the first group 3 places backward in the English alphabet.Explanation:In DHL:AEI,D→A is a shift of −3 positions.H→E is a shift of −3 positions.L→I is a shift of −3 positions.Apply the same shift to QUY:Q−3=NU−3=RY−3=VSo the required letter group is NRV.