Answer and explanation

Correct answer: D. The teacher, who had marked the tests overnight, handed them back.

  1. Step 1: Extra information between subject and verb needs a comma on each side.
Answer
The teacher, who had marked the tests overnight, handed them back.
Why not the others: The teacher who had marked the tests overnight, handed them back.: the comma separates the subject from its verb. The teacher, who had marked the tests overnight handed them back.: the second comma is missing after the extra information. The teacher who, had marked the tests overnight, handed them back.: the commas are in the wrong places.

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