Answer: the correct answer is (A) If Stonebridge does not raise taxes on its residents to maintain its infrastructure, the city will become much less attractive to live in as that infrastructure decays.
Explanation:
Situation: When a city loses population due to migration, fewer residents remain to pay to maintain the city's infrastructure, so property taxes tend to rise. These property taxes drive even more residents away. The city of Stonebridge is starting to lose population, so Stonebridge should not raise property taxes.
Reasoning: What would weaken the idea that the city should refrain from raising property taxes? That the city would decay because it wouldn't have money to maintain the infrastructure so A is correct.