OG4 阅读 Q12

Choice D is the best answer. The author notes that one of "the most powerful demographic events of the past decade [was] the movement of African Americans out of central cities" (lines 14-17,"A closer...Chicago alone").
Choices A, B, and C are incorrect because the author does not state that the unemployed, immigrants, or young professionals moved away from central-city areas in large numbers in the early 2000s.