Economists analyzed four regional economies after a tax reform: Region 1, GDP growth +2.4% (vs. +2.3% national); Region 2, +3.1% (vs. +2.3% national); Region 3, +2.5% (vs. +2.3% national); Region 4, +5.4% (vs. +2.3% national). They concluded that the reform's impact was concentrated in Region 4, with negligible effect elsewhere. The data most uniquely supporting this concentration claim is ______
Which choice most logically completes the text using the data above?
- Acheck_circle
the contrast: Regions 1, 2, and 3 grew within 0.8 points of the national rate, while Region 4 exceeded national growth by over 3 points.
- B
Region 1's 2.4% growth.
- C
Region 4's 5.4% growth alone.
- D
the average growth across regions.
Explanation
"Concentrated in Region 4, negligible elsewhere" requires showing R4 stands far apart from both the others and the national baseline. Choice B captures this contrast exactly, uniquely supporting the concentration claim.