单选题 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