Which of the following sentences contains a restrictive clause?

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My mom, who usually eats with us, will dine out tonight.
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The boy who is running toward us is my cousin.
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Mom will be dining with us tomorrow.
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I’m eating a blueberry doughnut, which is my favorite kind.
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1 answer

The sentence that contains a restrictive clause is:

"The boy who is running toward us is my cousin."

In this sentence, the clause "who is running toward us" is essential for identifying which boy is being referred to, making it restrictive.