Answer and explanation

Correct answer: C. My sister, who lives in Ramallah, teaches mathematics.

  1. Step 1: 'Who lives in Ramallah' is extra, non-essential information. Step 2. Extra information inside a sentence is set off by a pair of commas. Answer: My sister, who lives in Ramallah, teaches mathematics. Why not the others: the others have one comma or commas in the wrong place.

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