Which sentence is punctuated correctly?

The clause “who is a waitress at Billy’s Big Burger Shack” adds extra information about the speaker’s sister, so it should be set off with commas. Choice C does this correctly. In A, the appositive “president of the National Honor Society” needs commas; B incorrectly sets off the essential clause “that my father grew up in”; and D wrongly places a comma between the subject and verb.

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