Which of the following terms will replace the question mark (?) in the given series?
$$\text{CHO, DIP, EJQ, ?}$$

Let's map the simple linear progression rule followed by individual corresponding character places:
* First letter: $\text{C}\stackrel{+1}{\to }\text{D}\stackrel{+1}{\to }\text{E}\stackrel{+1}{\to }\mathbf{F}$
* Second letter: $\text{H}\stackrel{+1}{\to }\text{I}\stackrel{+1}{\to }\text{J}\stackrel{+1}{\to }\mathbf{K}$
* Third letter: $\text{O}\stackrel{+1}{\to }\text{P}\stackrel{+1}{\to }\text{Q}\stackrel{+1}{\to }\mathbf{R}$

Putting the solved elements together provides the next combination: FKR.