GMAT Critical Reasoning (CR) | Re: When a city experiences a sharp decline in population, the

So just to sum up the discussion above, A is strong because of the premise in the stimulus that states that higher tax revenue would just further the problem, and with less tax revenue there will be other services not provided if water and policing is not deteriorating?

D looks too good to be true on a problem like this. I still went with it although had a feeling it was wrong because we don't know the behavior to other cities.

Please clarify my reasoning if I am wrong.