Which of the following sentences is correctly written without commas because it contains a restrictive clause?

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Sam who is my nemesis will be competing against me.
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They played jazz which is my favorite genre of music.
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That sandwich which has been here since yesterday is not fit to eat.
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The pen that ran out of ink is mine.
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1 answer

The sentence that is correctly written without commas because it contains a restrictive clause is:

The pen that ran out of ink is mine.

In this sentence, the clause "that ran out of ink" is essential to identify which pen is being referred to, so no commas are needed.