challenge: What is the original source of the tune for the song 'Younger Girl'?
  
  A. Cannon's Jug Stompers' 1930 song 'Jug Band Blues'
  B. Cannon's Jug Stompers' 1930 song 'Prison Wall Blues'
  C. John Sebastian's 1965 song 'Do You Believe in Magic'
  D. The Lovin' Spoonful's 1966 album 'Hums of the Lovin' Spoonful'
  Answer: 