Why would an author use an allusion?
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a. to persuade the reader to agree with a specific point of view
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b. to the reader predict upcoming events in a story
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c. to provide the reader with concrete details or information
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d. to show how two seemingly contradictory things are alike

An author uses an allusion so that he or she can provide the reader with concrete details or information. An illusion helps in presenting a real picture of which the author wants to show to its reader. The illusion is also helpful comparing an imaginary thing to a real object or real things which is present in the real world and about which everyone is aware.

For example if an author want to tell about the beauty of something then he or she will give an illusion of something which is beautiful according to the all and exists in the real world such as moon which is consider as beautiful by everyone.

just need the points

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