What Does the Number of American Deaths Suggest About WWI

What does the number of American deaths suggest about WWI casualties?

A) Deaths from disease, famine, and other war-related causes were higher than combat deaths.
B) Civilians were often targets of military action, leading to large number of civilian deaths.
C) The lower number of non-combat deaths indicate the small impact the war had on civilian life.
D) Most causalities resulted from trench warfare, with only a small number of non-combatant deaths.
E) Better sanitary conditions in military hospitals meant military personnel received better medical care than civilians.