Religious and ethnic divisions in Nigeria have led to conflict. When northern Muslim military officers staged a coup, the Ibo people -- natives of southeastern Nigeria -- waged a war for independence. ... But ethnic and religious divisions have regularly led to conflict since then.
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Answer:
A hyperbole is exaggeration.
Having this in mind, the sentence that demonstrates the use of hyperbole is B. I was so hungry that I made myself the biggest sandwich in the world.
It isn't really the biggest sandwich in the world - it is exaggeration