challenge: Why did Manchester City not participate in European club football competitions in the mid-1950s?
  
  A. They were not performing well domestically during this period
  B. They were not invited to participate in the European Cup
  C. They did not have enough international players in their team
  D. They were not invited to play in the Inter-Cities Fairs Cup and the European Cup Winners' Cup did not start until 1960
  Answer: 