单项选择题
The spatial distribution of different racial and ethnic populations demonstrates that segregation persists in virtually all of America’s housing markets, from large urban areas to rural counties. What exactly are the ill-Line effects of this demographic isolation The most extreme geographic segregation is unique to black Americans and apparently unrelated to economic status and not explained by preferences for the residence, thus strongly suggesting the persistence of racial discrimination. In contrast to poor whites, who typically live dispersed among better-off families, poor blacks, because of residential segregation, are concentrated in poor neighborhoods. As a result, residential segregation contributes to the problems of these areas, including high concentrations of poverty, educational failure, unemployment, extramarital parenthood, crime, and high mortality. In addition, the increasing importance of suburbs as centers for commerce and habitation has drained resources frominner cities and led to a cyclic decline in the political will to address poverty and urban decline, both of which disproportionately affect ethnic minorities.
The passage suggests that the spiraling decline of black neighborhoods can be blamed primarily upon（）. A．a lack of political will within underprivileged communities to counter the economic effects of segregation
B．the diminished significance of urban black neighborhoods as economic and residential centers relatively to other areas of the city
C．the tendency of poor blacks to live among other poor minorities, unlike poor whites, who live dispersed among rich whites
D．the uniqueness of the geographic pattern in which black communities have developed in America, relative to other communities
E．a lack of resources within the urban black American communities to resist the forces which lead to segregation