Which of the following sequences of events leading up to World War II is accurate?

Which of the following sequences of events leading up to World War II is accurate?
 
  a. the establishment of Franco's dictatorship in Spain, Italy's invasion of Ethiopia, Anschluss, the formation of the Berlin-Rome Axis
  b. Italy's invasion of Ethiopia, the formation of the Berlin-Rome Axis, Anschluss, the establishment of Franco's dictatorship in Spain
  c. the formation of the Berlin-Rome Axis, the establishment of Franco's dictatorship in Spain, Anschluss, Italy's invasion of Ethiopia
  d. Anschluss, the establishment of Franco's dictatorship in Spain, Italy's invasion of Ethiopia, the formation of the Berlin-Rome Axis
  e. none of the above