The verified answer to “In a certain code, MILK is written as ILKM. How will ROOM be written in that code?” is OOMR, option B. The source working states: Correct answer: OOMR (Option C). Apply the same unchanged rule to ROOM: R→O, O→O, O→M, M→R. Therefore the required code is OOMR. Wrong options: SPPN is wrong because it does not reproduce the verified rule at every position; TQQO is wrong because it does not reproduce the verified rule at every position; QNNL is wrong because it does not reproduce the verified rule at every position. Even one mismatched position invalidates a code, so only Option C is correct. This observation must be confirmed across every available letter position or every consecutive term before it is applied to the missing code. Applying the verified rule to the target expression produces OOMR. The alternatives TQQO, QNNL and SPPN fail because at least one position does not obey the same transformation. A useful final check is to map OOMR backward through the inverse operation and confirm that the original target is recovered.