Perhaps the most telling evidence of the cultural assimilation of white ethnic groups in American ...

Perhaps the most telling evidence of the cultural assimilation of white ethnic groups in American society is:
 
  a. changing one's beliefs about divorce.
  b. moving away from the family occupation.
  c. losing knowledge of one's mother tongue.
  d. rejecting traditional family rituals.

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Which perspective proposes that a movement towards more complete assimilation proceeds irreversibly with each successive generation?
 
  a. Straight-line theory
  b. Symbolic ethnicity theory
  c. Ethnic options hypothesis
  d. Unhyphenated white thesis