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.
A synonym is a word that is similar is meaning to another word. For example a synonym for happy is excited
The prefix of advantageous is ad which means ''toward'' and indicates a direction or tendency.
Don't know what you mean? kinda confusing actually