Numbers are placed in the table rows below on the basis of a specific arithmetic rule. Find the correct alternative to replace the question mark.

Let us look closely at the mathematical interval pattern of differences between consecutive terms across the two rows:
* Row 1:

$$5\stackrel{+4}{\to }9\stackrel{+5}{\to }14\stackrel{+6}{\to }20$$

The sequence increment values step up progressively by $+1$: $+4,+5,+6$.
* Row 2:

$$9\stackrel{+8}{\to }17\stackrel{+10}{\to }27\stackrel{+12}{\to }?$$

The increment values here are exactly double those of the first row ($+8,+10,+12$).

Applying this addition rule to find the final missing value:

$$\text{Missing number}=27+12=39$$