Which sentence uses commas correctly to mark extra information?

Answer and explanation

Correct answer: A. My brother, who lives in Leeds, is a nurse.

  1. Step 1: Extra information inside a sentence is marked off with a pair of commas, one before and one after.
  2. Step 2: 'My brother, who lives in Leeds, is a nurse' is correct.
Answer
My brother, who lives in Leeds, is a nurse.
Why not the others: My brother who lives in Leeds, is a nurse.: The opening comma is missing. My brother, who lives in Leeds is a nurse.: The closing comma is missing. My, brother who lives in Leeds, is a nurse.: The first comma is in the wrong place.

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