Answer: B) he's been in town for a week now but stayed home every evening.
Explanation: In literature, the theme is the underlying message of a story, it is what critical belief about life is the author trying to convey in the writing of a novel, play, short story or poem. Usually this belief, or idea, is universal and transcends cultural barriers. From the given options, the one that supports the theme of isolation, is the corresponding to option B, because the fact that he stayed home every evening, conveys the idea of loneliness and isolation.