Joan Didion's use of extended metaphor comparing her time in New York to a movie affects the tone of the excerpt because it creates a nostalgic, meditative tone as Didion reflects on how quickly her time in New York seemed to pass. (option B)
In literature, tone refers to the way an author or a narrator approaches a certain topic, that is, her attitude towards it. In the excerpt, Didion's tone is one of nostalgia, that is, of sentimental memory.
She uses metaphor to compare her experience to that of a movie character to show how her time in New York felt surreal to her. All of a sudden, years seemed to have gone by. Yet, she remembers that time with feeling and yearning.
With the information above in mind, we can choose option B as the correct answer.
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