I believe that the answer is A, interest and hospitality. Mrs. Farquhar is happy to serve the soldier and get him a glass of water, while Mr. Farquhar inquires about news about the war. They then discuss the Owl Creek Bridge. I do not think that the questions are interrogating, and the tone is not suspicious, so you can rule those answers out. Since Mrs. Farquhar goes inside while her husband talks to the soldier, they do not both engage in polite conversation, so you can also eliminate D. Hope this helps.
