Which sentence correctly sets off a non-essential clause with commas?

Answer and explanation

Correct answer: C. My sister, who lives in Ottawa, is a nurse.

  1. Step 1: A non-essential clause is set off by commas on both sides. Step 2. Both commas are needed. Answer: My sister, who lives in Ottawa, is a nurse. Why not the others: the others use one comma or a semicolon.

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