the answer is C, "The Wizard of Oz" (quotation) because it is referring to it.
Answer:
an indirect reference to a place, person or a event
Explanation:
<em> </em><em>allusion </em><em>is </em><em>an expression designed to call something to mind without mentioning it explicitly; an indirect or passing reference.</em>
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The answer is B )they are useful for organizing your thoughts