Answer:
b.That part of international law that regulates the conduct of hostilities
Step-by-step explanation:
The Law of war is a part of international law that regulates and determines the conditions for war and the way in which the parties involved conduct themselves and activities. The aim of law of war is to curtail the amount of suffering caused by the war.
The law of war has defined the sovereignty of nationhood, the states and its territories and its occupations in international law.
There are new modern laws of war which clearly state or define issues such as modern laws of war, the declaration of war, the method of acceptance of surrender, and the treatment of prisoners of war, the presence of military if necessary or not and also the restrictions of some certain weapons during war that may or can cause untold suffering to citizens of the warring nations.