Which of the following is an example of hyperbole?

Hyperbole is a figure of speech that involves exaggeration for emphasis or effect, often used to create a strong impression or to convey a feeling more intensely. The statement "I am so hungry I could eat a horse" illustrates hyperbole because it dramatically exaggerates the speaker's level of hunger. It implies an extreme condition that is not literally possible, and the purpose is to emphasize just how hungry the speaker feels. This makes it clear that the speaker is expressing their hunger in a way that goes beyond reality for dramatic emphasis.

The other examples do not use exaggeration to convey a strong emotional state or to create a vivid image. The sky being described as blue is a straightforward observation without embellishment. A request to close the door is a simple command with no exaggerative quality. Saying someone runs very quickly presents a fact about someone's speed but does not involve any hyperbolic expression.