challenge: When was Sonelgaz established and what did it replace?
  
  A. Established in 2002, replacing Electricité et gaz d'Algérie
  B. Established in 1969, replacing Electricité et gaz d'Algérie
  C. Established in 1969, replacing the National Company for Electricity and Gas
  D. Established in 2002, replacing the National Company for Electricity and Gas
  Answer: 