Which of the following best explains the concept of total war?
A. the U.S. decision to delay entering the war until 1917, but then commit themselves entirely to supporting the Allies
B. the decision by the Allies to use resources from their colonies, instead of making those at home get involved in the war
C. a type of war in which participants use all available resources to support their war efforts, including civilians doing work on the home front
D. the Allies' use of trenches in World War I, which prolonged attacks against the Central powers and were very deadly