单选题 Which of the following statements best summarizes a distinction mentioned in the passage between public-sector employment and those of private-sector employment'?

• (A) Private-sector work involves a lesser degree of immigrant competition than public-sector work.
• (B) A growing educational level has assisted African Americans find work in the private-sector more than it has done so in the public-sector.
• (C) Immigrant population gains have benefited workers in the public-sector more than they have workers in the private-sector.
• (D) Private-sector work often requires less in the way of educational credentials than public-sector work.
• (E) The private-sector tends to contain stronger ethnic networks than the public sector.