What was a key factor to victory in the Montgomery bus boycott?

a. the governor of Alabama ordering the buses to desegregate

b. the orderly and nonviolent approach of the demonstrations

c. the assassination of President Kennedy

One of the key factors to victory in the Montgomery bus boycott was " b. the orderly and nonviolent approach of the demonstrations," since this put pressure on state officials to de-segregate the busses without taking away from the cause itself.