Why Is Diplomacy Often Preferred Over Use of the Military

Why is diplomacy often preferred over use of the military to settle foreign policy disagreements?

A) Diplomacy is more likely to be successful.
B) Diplomacy is more likely to lead to military alliances.
C) Diplomacy is more likely to lead to isolationism.
D) Diplomacy is less likely to lead to war.
E) Diplomacy is less likely to be appropriate for trade disagreements.