challenge: According to Robert Palmer's 1976 review in Rolling Stone, what dual role does Bob Marley perform on the album Rastaman Vibration?
  
  A. Representative of the music industry and advocate for economic development
  B. Spokesman for the Jamaican government and avatar of reggae music
  C. Ambassador for the Rastafarian movement and voice for social justice
  D. Spokesman for the Third World's disadvantaged and avatar of a highly commercial brand of popular music
  Answer: 