Answer: Manipulation of audience to emphasize one side
Explanation:
Card stacking technique in literature is looking up to a audience perception and it is trying to manipulate those perception or ideas with showing two or many sides in which one side is emphasized.
Why it is called a card stacking? Originally this name comes from ''stacking the deck'' magician's gimmick. It is used because of the cards that are ''stacked'' in a order that magician wants it and because he knows the order he can control them.
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