IQ test scores of black children (174)

IQ test scores of black children
 
  (174)
   a. are almost always lower than the scores of white children.
   b. are almost always lower than the scores of white children living in the same
  geographic area.
   c. are almost always lower than the scores of white children from the same
  economic background.
  d. have been found to improve with better economic and learning environments.

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One major cost of slavery to whites and their descendants is
 
  a. the loss of much of their own humanity.
  b. increasing freedom of speech and press.
  c. abundant wealth.
  d. both b and c.