I looked up who the main characters were and this popped up
The above quotation uses JUXTAPOSITION as a figure of speech.
Juxtaposition - a literary technique in which two or more ideas, places, characters and their actions are placed side by side in a narrative<span> or a poem for the purpose of developing comparisons and contrasts.
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An author's purpose is his reason for or intent in writing. An author's purpose may be to amuse the reader, to persuade the reader, to inform the reader, or to satirize a condition.
I think the answer is a because of how a is answers