challenge: Who is credited with creating the early versions of the song 'Nkosi Sikelel' iAfrika', which 'Mungu ibariki Afrika' is based on?
  
  A. Enoch Sontonga and Nelson Mandela
  B. Enoch Sontonga and Martin Luther King Jr.
  C. Samuel Mqhayi and Nelson Mandela
  D. Samuel Mqhayi and Enoch Sontonga
  Answer: 