Final answer:
The theme of A Farewell to Arms is the disillusionment and frustration about World War I. The novel explores the harsh reality and futility of war, as well as its impact on individuals.
Step-by-step explanation:
The theme of the novel A Farewell to Arms by Ernest Hemingway is the disillusionment and frustration felt about World War I. It captures the harsh reality and futility of war, as well as the impact it has on the individuals involved. The protagonist, Frederic Henry, experiences the horror of the war firsthand and becomes disenchanted with the ideals of heroism and nobility that were often associated with war. Through his experiences and relationships, Hemingway explores themes of love, loss, and the human condition in the face of war.