(A) ** everything was open to fighting, including civilians and cities
(B) the first time the army, navy, and air force were used together
(C) every country in the world was involved in fighting
(D) all of a country’s money would go totally to war
EXPLANATIONS BELOW
Concept note-1: -"Total war” includes four things: Mobilization, refusal to compromise, the blurring of roles between soldier and civilians, and total control of society. In many ways World War I was total war. There had never been a war that was so widely devastating.
Concept note-2: -World War I is often referred to as the first “total war.” People used this term to describe the size and devastation of the war, which included both soldiers and civilians. In 1917, French Prime Minister Georges Clemenceau explained how the total war affected his country.
Concept note-3: -total war, military conflict in which the contenders are willing to make any sacrifice in lives and other resources to obtain a complete victory, as distinguished from limited war. Throughout history, limitations on the scope of warfare have been more economic and social than political.
Concept note-4: -World War I, also known as the Great War, began in 1914 after the assassination of Archduke Franz Ferdinand of Austria. His murder catapulted into a war across Europe that lasted until 1918.
Concept note-5: -World War I, also called First World War or Great War, an international conflict that in 1914–18 embroiled most of the nations of Europe along with Russia, the United States, the Middle East, and other regions.