The best example of a simile among the given options is:
C. Don't tell the coach; he's as hot-tempered as a kettle.
Explanation:
1. A simile is a figure of speech that compares two different things using the words "like" or "as."
2. In the sentence "he's as hot-tempered as a kettle," the comparison is made between the coach and a kettle using "as," making it a simile.
3. This comparison helps create a vivid image in the reader's mind, emphasizing the coach's temper by likening it to the heat and pressure of a kettle.
4. The other options do not contain a direct comparison using "like" or "as," making them metaphors or descriptive statements that do not fit the definition of a simile.