The problem asks us to find the coding pattern used to transform 'QVZFG' into 'OMFAU' and then apply this pattern to code the word 'RNTWS'. The correct code for 'RNTWS' is 'ADZSV'.

Discovering the Coding Pattern

Let's compare the original word QVZFG and its code OMFAU:

• Q V Z F G
• O M F A U

A direct letter-to-letter shift doesn't yield a consistent pattern. Let's test reversing the original word.

1. Reverse the original word: 'QVZFG' reversed is 'GFZVQ'.
2. Compare the reversed word with the code:
   • G F Z V Q
   • O M F A U
   Now let's check the shifts between these letters. We'll use the letter positions in the alphabet (A=1, B=2, ..., Z=26).
   • G (7) to O (15): The shift is $15 - 7 = +8$.
   • F (6) to M (13): The shift is $13 - 6 = +7$.
   • Z (26) to F (6): The shift is $6 - 26 = -20$. In modulo 26 arithmetic, this is equivalent to $+6$ ($26 + 6 = 32 \equiv 6 \pmod{26}$).
   • V (22) to A (1): The shift is $1 - 22 = -21$. In modulo 26 arithmetic, this is equivalent to $+5$ ($22 + 5 = 27 \equiv 1 \pmod{26}$).
   • Q (17) to U (21): The shift is $21 - 17 = +4$.
   The pattern observed is: Reverse the word and apply sequential shifts of +8, +7, +6, +5, +4.

Applying the Pattern to 'RNTWS'

Using the confirmed pattern:

1. Reverse the target word: 'RNTWS' reversed is 'SWTNR'.
2. Apply the sequential shifts (+8, +7, +6, +5, +4) to 'SWTNR':
   • S (19) + 8 = $19 + 8 = 27$. $27 \pmod{26} = 1$, which corresponds to A.
   • W (23) + 7 = $23 + 7 = 30$. $30 \pmod{26} = 4$, which corresponds to D.
   • T (20) + 6 = $20 + 6 = 26$. $26 \pmod{26} = 0$, which corresponds to Z (the 26th letter).
   • N (14) + 5 = $14 + 5 = 19$, which corresponds to S.
   • R (18) + 4 = $18 + 4 = 22$, which corresponds to V.
   The resulting coded word is 'ADZSV'.

This matches Option D.