A fragment is a vague and insufficient sentence. The option 'when he was done,' is an example of a sentence fragment. Thus, option c is correct.
What is a sentence fragment?
A sentence fragment is a phrase or a sentence that is missing a primary verb or the subject and is incomplete because of typographical errors or omitting words.
The third sentence, 'when he was done,' is a fragment as the reader is not aware of what the person is done working with. The sentence is incomplete as the idea is not present.
Therefore, option c. 'when he was done,' is the correct example.
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