Read the sentence. While she slept the alarm kept ringing in Jamie's ear. According to The Elements of Style , what is the correct way to revise this sentence?

The opening clause, “While she slept,” is an introductory dependent clause, so it should be followed by a comma before the main clause. The corrected sentence is “While she slept, the alarm kept ringing in Jamie’s ear.” Choice A adds the needed comma without changing the sentence’s meaning.

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