Answer and explanation

Correct answer: C. The teacher, who had marked the papers, returned them on Monday.

  1. Step 1: A non-defining clause needs commas on both sides.
  2. Step 2: Only the sentence 'The teacher, who had marked the papers, returned them on Monday.' puts commas around 'who had marked the papers'.
Answer
The teacher, who had marked the papers, returned them on Monday.
Why not the others: The others place commas in the middle of a clause.

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