Why Would Civil War Be Seen as a Bargaining Failure

Why would civil war be seen as a bargaining failure?

A) If they are fighting,then they could not have possibly agreed upon a nonwar solution.
B) An agreement short of war should generally be possible for both the state and nonstate actors.
C) A civil war only breaks out if the two sides cannot agree to a cease-fire.
D) Most bargaining interactions about civil wars occur between two states.
E) It is a bargaining failure,as the bargaining model of war fails to describe the processes that guide a civil war.