Why did Frederic Henry perspective/attitude toward war change in "A Farwell to arms by Hemingway"?

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What sign post goes with the quote goodnight goodnight parting is such sweet sorrow. that i shall say goodnight till it be morrow

Read this passage from william faulkner's the sound and the fury: i says no i never had university advantages because at harvard they teach you how to go for a swim at night without knowing how to swim and at sewanee they dont even teach you what water is. i says you might send me to the state university; maybe i'll learn how to stop my clock with a nose spray and then you can send ben to the navy i says or to the cavalry anyway, they use geldings in the cavalry. which best describes the narrator's tone in this passage? a. bitter b. angry c. sarcastic d. all of the above