In a secret encryption code, the word 'SOLAR' is encoded as 'VRODU'. Using the exact same systematic letter-shift rule, how is the word 'LUNAR' encoded?

Answer and explanation

Correct answer: B. OXQDU

  1. Step 1: Analyze cipher shift between 'SOLAR' and 'VRODU':
  2. Step 2: S (19) -> V (22): +3; O (15) -> R (18): +3; L (12) -> O (15): +3; A (1) -> D (4): +3; R (18) -> U (21): +3.
  3. Step 3: The encryption rule is a Caesar cipher shifting every letter forward by +3 positions.
  4. Step 4: Apply +3 shift to 'LUNAR': L (12)+3 = O (15); U (21)+3 = X (24); N (14)+3 = Q (17); A (1)+3 = D (4); R (18)+3 = U (21).
  5. Step 5: Assemble result: 'OXQDU'.
Answer
OXQDU.
Why not the others: 'OXQDS' fails to shift the final letter R; 'NXQDU' shifts L by only +2; 'PWREV' shifts all letters by +4.

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