Sarah, _______ quickly contacted the IT department to retrieve the corrupted file.
Which choice completes the text so that it conforms to the conventions of Standard English?
who noticed that the quarterly report was missing,
who noticed that the quarterly report was missing
who noticed that the quarterly report was missing
who noticed that the quarterly report was missing;
Correct Answer: A
Choice A is the best answer. The clause "who noticed that the quarterly report was missing" is a nonrestrictive relative clause modifying Sarah. It provides extra context but isn't essential to identifying her. Therefore, it must be enclosed in commas.
Choice B is incorrect because it is missing the closing comma. Choice D is incorrect because a semicolon cannot be used to set off a relative clause inside a sentence.