Which statement best describes ethnic relations in the U.S. today?

Which statement best describes ethnic relations in the U.S. today?
 
  a. The public is more pessimistic about the future of ethnic relations.
  b. Ethnic conflict is more virulent than in previous generations.
  c. The black/white binary is less useful for understanding ethnic relations.
  d. Ethnic divisiveness is one primary outcome of multiculturalism.

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The melting pot is a metaphor for describing how American society is becoming:
 
  a. more homogenous.
  b. more heterogenous.
  c. more tolerant of ethnic diversity.
  d. less tolerant of ethnic diversity.