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To strengthen a causal claim (stadium → higher revenues), provide evidence that ties the effect to the intervention while ruling out confounds. Option B does both: it compares local effects (adjacent neighborhoods) to the citywide baseline and states that the analysis controls for overall economic growth. A localized bump (18%) exceeding the general 8% after adjustment strongly suggests the stadium contributed to incremental revenue via spillovers (sales, tourism, property values). Option A undermines causality by showing the same increase elsewhere absent a stadium—consistent with a broader macro trend. Option C (signing star players) is tangential; it might affect attendance but doesn’t connect to tax revenues or control for other variables. Option D is irrelevant to finances. Strong GRE Argument answers highlight difference-in-differences logic: compare treated and untreated areas before/after while controlling for common shocks. Evidence that isolates the treatment effect offers the most persuasive causal support.