The correct answer would be the third option. Based on the given excerpt above from Hemingway’s A Farewell to Arms, the excerpt exemplifies how Hemingway's dialogues typically includes <span>colorful language and specific word choices to define complex ideas. Hope this is the answer that you are looking for.</span>
Careful is already a adjective so keep that.
There are many adjectives for change but what suits the best here is “changing”.
Careful changing is the best I could find.
Hope that helped
