Answer: The revision that best reduces the wordiness in the sentence without changing its overall meaning is A. "Genetic researchers recently isolated the gene that determines a person's natural sleep cycle".
Explanation: Wordiness is the presence of too many words in a sentence, paragraph or text. Moreover, wordiness is usually considered a mistake since it implies that the author uses redundant expressions or more words than necessary when trying to refer to a single idea. Option A. is the only one that reduces the wordiness in the sentence provided since it does not include the phrase "during recent research", which means it avoids using the word "research". Moreover, option A. expresses the idea "the natural times a person sleeps and walks" in fewer words ("a person's natural sleep cycle").
