Find the appropriate option to replace the question mark WINTER : RETNIW :: ?

Concept: In a letter-reversal analogy, the second word is formed by writing the letters of the first word in exact reverse order — same letters, no additions, omissions, or substitutions.

Application: Applying this rule step by step:

1. WINTER has six letters: W, I, N, T, E, R.

2. Reversing this order gives R, E, T, N, I, W, which spells RETNIW — confirming the rule from the given pair.

3. Apply the same rule to SPRING: its letters are S, P, R, I, N, G.

4. Reversing this order gives G, N, I, R, P, S, which spells GNIRPS.

Cross-check: Checking this against the other pairs:

• SUMMER reversed letter-by-letter is REMMUS, not RMMEUS — the letters are out of sequence, so this pairing does not follow the rule.

• HEAVEN (six letters) and GOD (three letters) cannot be a reversal pair at all, since reversal never changes the letter count.

• KNIFE and BLADE are linked by meaning, not by letter reversal — BLADE is not KNIFE's letters written backwards.

Result: Only SPRING : GNIRPS is the exact letter-reversal of SPRING's own letters, matching the pattern established by WINTER : RETNIW.