Which literary device involves exaggeration for emphasis?

Hyperbole is a literary device that involves intentional exaggeration to create emphasis or to convey strong feelings or impressions. It goes beyond literal statements to evoke a heightened response from the reader or listener. For example, saying "I've told you a million times" is an exaggeration that emphasizes frustration or urgency rather than a factual recounting of events. This device is particularly effective in poetry and creative writing, where it can provide humor, drama, or intensity to a narrative.

In contrast, the other options represent different literary devices. Alliteration focuses on the repetition of initial consonant sounds to create rhythm or musicality in language, while metaphor involves an implicit comparison between two unlike things to illuminate a specific characteristic or concept. Oxymoron presents two contradictory terms together for rhetorical effect, like "bittersweet." Each of these serves a distinct purpose in literature, but hyperbole is specifically recognized for its exaggeration, making it stand out as the correct answer.