1. In World War I, 46% of U.S. Armed Services deaths were due to battle.
2. In World War II, 72% of U.S. Armed Services deaths were due to battle.
Question: What explains this increase in the percentage of battle deaths?
(A) The United States was fighting only one major enemy in World War I, but two major enemies in World War II.This fact focuses on the number of enemies but doesn’t address why a higher percentage of deaths were caused by battle rather than disease or other factors. It doesn’t provide an explanation for the shift in the causes of deaths.
Eliminate.
(B) Compared to World War I, a greater percentage of deaths in World War II were battle deaths for the combined total of all armed services involved in each war.This merely restates the fact we are trying to explain: that a higher percentage of deaths in World War II were battle deaths. It doesn't provide an underlying reason for the change.
Eliminate(C) The widespread use of chemical weapons in World War I resulted in many battle deaths that were not caused directly by gunfire or explosives.While this explains how battle deaths were caused in World War I, it doesn’t explain why the proportion of battle deaths increased in World War II. The use of chemical weapons doesn’t directly clarify the shift in the percentage of deaths.
Eliminate. (D) There were more deaths in the United States as a result of disease in World War I than in World War II.This is highly relevant. If disease caused more deaths in World War I than in World War II, then the percentage of non-battle deaths (deaths not caused by enemy action) would have been higher in World War I. This would explain why battle deaths were a smaller percentage in World War I and a higher percentage in World War II.
Keep this for now.(E) Technological advances after World War I improved the ability of all armed services to reduce the lethality of disease and infection in World War II.This provides a solid explanation for the decrease in deaths caused by disease in World War II. As fewer soldiers died from disease due to medical advances, a greater proportion of deaths would have been caused by battle, which would raise the percentage of battle deaths.
This is a strong answerBoth
(D) and
(E) point to the idea that fewer deaths from disease in World War II led to an increase in the proportion of battle deaths. However,
(E) provides a clearer, more direct explanation: medical and technological advances specifically reduced the number of disease-related deaths, which directly explains the shift in proportions. Where (D) doesn't do a great job is justifying why there were more deaths related to diseases in World War I than in World War II, a gap that E bridges quite well.
(E) is the correct answer.