The correct answer is <span>D. As Jake was reading the letter from June yet again, the flight attendant coughed gently to get his attention.
That is because all three previous sentences are compound and not complex which means both clauses from them are independent, while D has a subordinate clause.</span>
To answer this question i would need to have more information on what you are dealing with. If you can link this with more information that would be great.
