Given What We Learned from the Iran-Iraq War, One Might

Given what we learned from the Iran-Iraq war, one might conclude that wars in general end when ________.

A) both sides are evenly matched in terms of weapons and troops
B) one side gains a clear weapons advantage
C) one side has a weapons advantage that is counteracted by the other's troop (number) advantage
D) one side's will to fight is depleted
E) both sides abandon conventional warfare