Final answer:
The sentence that uses metaphor is option D: 'He was not a boy; he was a man.'
Step-by-step explanation:
The sentence that uses metaphor is option D: He was not a boy; he was a man. A metaphor is a figure of speech that compares two unlike things without using the words 'like' or 'as'. In this sentence, the speaker compares the boy and the man, suggesting that the boy has matured into a man.
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