What is the purpose of an allusion? to evoke an idea with minimal words to show causal relationships to distract the audience to resolve conflict

The answer is: to evoke an idea with minimal words.

An allusion is a figure of speech or rhetorical figure in which, through the use of figurative language an idea, object, or circumstance is evoked in an indirect or covert manner. It is indirect because the process of interpretation through which the reader must arrive at the implied object is left to the reader as a task to be completed. The opposite of an allusion would be a direct or overt reference.  

b. vast setting

explanation:

an epic is a poem of heroic proportions; it can't be short or focus on simple daily life event. it cannot be written with a casual tone as it narrates some heroic deeds of legendary figures.    

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