Select the lettered pair that has the same relationship as the original pair of letters:
$$\text{MAN : PDQ : : WAN : ?}$$

Let's trace the alphabetical shift between the letters of the first pair:
* $\text{M}\stackrel{+3}{\to }\text{P}$
* $\text{A}\stackrel{+3}{\to }\text{D}$
* $\text{N}\stackrel{+3}{\to }\text{Q}$

Applying this exact shift pattern to the term $\text{WAN}$:

* $\text{W}\stackrel{+3}{\to }\mathbf{Z}$
* $\text{A}\stackrel{+3}{\to }\mathbf{D}$
* $\text{N}\stackrel{+3}{\to }\mathbf{Q}$

The resulting term is $\text{ZDQ}$.