What percentage of Navy personnel were reservists at the end of WWII?

At the end of World War II, approximately 80% of Navy personnel were reservists, which aligns with the answer choice indicating four-fifths of the personnel. This high percentage reflects the significant reliance on reservists during the war as active-duty military forces expanded rapidly to meet the demands of the conflict. After the war, many reservists were demobilized, leading to a transition back to a peacetime Navy structure, but the figure during the peak of wartime service highlighted the vital role that reservists played in supporting the overall mission of the Navy during this critical period in history.

The other options do not accurately represent the historical context and data of Navy personnel composition at that time; they underestimate the percentage of reservists involved in Navy operations during World War II.