What are the key reason to include hyperbole in a literary work?

Let  me put it clear for you that Hyperbole is the use of exaggeration as a rhetorical device or figure of speech. It may be used to evoke strong feelings or to create a strong impression, but is not meant to be taken literally Hyperboles are exaggerations to create emphasis or effect. As a literary device, hyperbole is often used in poetry, and is frequently encountered in casual speech.
A key reason to include hyperbole in a literary work is that it includes to add humor and to heighten the effect.

The correct answer is b