Each of the questions presents a sentence, part of which is underlined. Beneath the sentence you will find four ways of phrasing the underlined part. Follow the requirements of standard written English to choose your answer, paying attention to grammar, word choice, and sentence construction. Select the answer that produces the most effective sentence; your answer should make the sentence clear, exact, and free of grammatical error. It should also minimize awkwardness, ambiguity, and redundancy.