This could probably best be grouped with the illustration category, as we are being asked to understand the principle behind the stimulus, and then find an analogous situation that also illustrates the same principle.
I'm not a big fan of diagramming a question like this- we are being asked to understand a general principle and then apply it in a similar situation. Rather, I would try to get as strong of an understanding of the principle at play here. If that principle is conditional, we could diagram it, but the structure of the correct answer does not have to match, only the principle.
In the stimulus, we have an example where we have two things that are working against each other- more people means more need for maintenance, but also means more money for maintenance. We are then told that raising prices improved maintenance since the effect of less need for maintenance is greater than the maintenance money lost.
While I am not exactly sure how to frame the principle, it likely has to do with the idea that despite taking an action (likely a price hike) that seems somewhat detrimental, it actually allows for better maintenance.
Answer choice E is pretty similar to this principle- in fact, it is a nearly identical argument structure. This is somewhat uncommon for the right answer to be the exact same argument structure, so I would try to focus my effort on understanding the argument and paraphrase it.
