According to the text, what is the key to social mobility for all racial and ethnic groups?

According to the text, what is the key to social mobility for all racial and ethnic groups?
 
  A) communication skills and integrity
  B) group solidarity
  C) formal education
  D) occupation in the government

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Regarding education, which of the following is not true?
 
  A) Black children are just as likely to earn their high school diploma as White children
  B) White children are more likely to have formal prekindergarten education than Black children
  C) Currently, the percentage of adults receiving college degrees is divided equally among Whites and Blacks
  D) All of the above