Step 1: Understanding the Concept:
Identify the pattern of jumps (addition/subtraction) between the letters of each group using their alphabetical positions ($A=1, B=2$, etc.).
Step 2: Detailed Explanation:
(a) D(4) $\xrightarrow{-3}$ A(1) $\xrightarrow{+7}$ H(8)
(b) I(9) $\xrightarrow{-3}$ F(6) $\xrightarrow{+7}$ M(13)
(c) R(18) $\xrightarrow{-3}$ O(15) $\xrightarrow{+7}$ V(22)
(e) S(19) $\xrightarrow{-3}$ P(16) $\xrightarrow{+7}$ W(23)
Step 3: Calculation:
Check (d): Q(17) $\xrightarrow{-3}$ N(14) $\xrightarrow{+6}$ T(20).
The second jump in this group is $+6$, whereas all others have a $+7$ jump.
Step 4: Final Answer:
The odd one out is QNT. Thus, the correct option is (d).