(A) is wrong because it distinguishes based on the size of a city rather than its growth rate. The stimulus gives us no information at all about smaller cities.

You should confidently eliminate (B) when it says estimates for rapidly growing cities – which vary wildly – are accurate enough to use in marketing. Big picture, the stimulus says estimates of rapidly growing cities are less reliable than estimates for stable cities. Pointing at the worse kind of estimate and calling it good is a vibes mismatch.

Separately, for (B) to be supported we'd ideally want our stimulus to establish some kind of standard or threshold for what makes data "good enough" to be useful for marketing. This stimulus lacks that.

If anything, the stimulus gives us reason to suspect (C) is false. These wildly-varying estimates for rapidly growing cities are caused by something – perhaps that something is their fluctuating (and therefore hard to predict) rate of population growth.

(D)'s correctness really highlights the difference between MBT and MSS questions. Typically I'd point out "equally reliable" as super-strong (and therefore sus) wording – it means "no more and also no less." That inference for sure fails the MBT standard.

In this MSS question, though, (D) just serves to highlight a big picture takeaway from the stimulus: when it comes to estimating the population of cities with a stable population, the companies all generated basically the same results.

We have no basis in the stimulus from which to infer any differences between current and future estimates.

The only explicit comparison of current and future population estimates comes from the stimulus' discussion of stable cities, where estimates for both time periods were similar in that they varied little from company to company.