Which is an example of a simile?

A simile is a figure of speech that makes a comparison between two different things using the words "like" or "as" to highlight similarities. The example "Her smile is bright like the sun" effectively illustrates this definition. Here, the brightness of her smile is directly compared to the brightness of the sun using "like," creating a vivid image in the reader's mind that emphasizes the beauty and radiance of her smile.

In contrast, the other examples do not utilize the comparative structure characteristic of similes. "Life is a journey" offers a metaphor but does not contain "like" or "as" for comparison. "The wind whispered through the trees" evokes personification instead of simile, attributing human qualities to the wind. "Time flies" is also a metaphor, suggesting the swift passage of time without a comparative format. Thus, the chosen example stands out as the only one that exemplifies a simile.