Final answer:
The quotation summarizing Vonnegut's feelings about war would emphasize the inhumanity and absurdity of conflict as reflected in literature, much like the disillusioning depictions in Hemingway's and Remarque's novels.
Step-by-step explanation:
The most accurately summarizes Kurt Vonnegut's feelings about war, based on the given excerpts, would likely involve the futility and tragedy of conflict, as portrayed through literature. The passages indicate how literary works, such as those by Ernest Hemingway, Erich Maria Remarque, and other authors, capture the misery and pointlessness of wars like World War I.
Hemingway's A Farewell to Arms and Remarque's All Quiet on the Western Front both depict the disillusionment with war and the absurdity of the heroism once associated with it. These novels provide a stark contrast to earlier beliefs in the nobility and heroism of war, highlighting its inhumanity and suffering instead.