challenge: What event in 1953 led to the formation of the National Resistance Movement (NRM)?
  
  A. The banning of the National Front
  B. The 1953 coup d'état against the government of Dr. Mohammad Mossadeq
  C. The sentencing of Mossadegh to three years in prison
  D. The coronation of the Shah as the dominant force in Iranian politics
  Answer: 