challenge: What did music critic Richie Unterberger say about the Everly Brothers' album 'Rock'n Soul'?
  
  A. It's their most creative work of the 1960s
  B. It's decently played and sung, but not among their most creative work
  C. It's a complete failure in terms of music quality
  D. It's a standout album in their discography
  Answer: 