A study compared volunteer rates (% of adults volunteering monthly) in four communities differing by community-center funding (high/low) and median household income (high/low): Community A, high funding + high income, 32%; B, high funding + low income, 28%; C, low funding + high income, 14%; D, low funding + low income, 11%. The researchers argued that community-center funding has a roughly equal effect on volunteer rates regardless of income level. The strongest data support is ______
Which choice most logically completes the text using the data above?
- A
the average rate across communities.
- Bcheck_circle
the comparison A vs. C (both high income: 32% vs. 14%, an 18-point gap) and B vs. D (both low income: 28% vs. 11%, a 17-point gap)—funding adds about the same amount in each.
- C
Community A's highest rate of 32%.
- D
Community D's lowest rate of 11%.
Explanation
"Roughly equal effect regardless of income" requires showing similar funding-driven gaps within each income stratum. Choice B captures this similarity (18 vs. 17 points), exactly supporting the claim.