Final answer:
The sentence that contains the best example of a simile is option D: The football player was a bear; he was unstoppable.
Step-by-step explanation:
The sentence that contains the best example of a simile is option D: The football player was a bear; he was unstoppable. A simile is a figure of speech that compares two different things using the words 'like' or 'as', and in this sentence, the football player is being compared to a bear. By using this comparison, the sentence emphasizes the player's strength and determination.
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