The authors theme;what message is he trying to get across to the reader? The authors style;what elements of literature does he use to make the story understanding and interesting. Elements are: Imagery, Simile, Metaphor, Irony, Figurative language, Rome Sceme, Point of View etc..
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The answer here is B. The phrase is "on the left." It is telling you where. An adverb phrase can tell you either why, where, how, or when.
