The correct answer is tone. Imagery is using vivid description while style is the personal type of narration like what words they use or grammatical constructions. Theme is the underlying idea while the voice is seen through the tone, whether it's dark and broody or joyful or anything similar.
The point of view that is revealed is that she is scared and is assuming that the minister's family is not going to like their christmas dinner and the way that their family act.
