What text? You haven’t provided any?
The conclusion that the writer should add to summarize the argument of the passage is: "Hence, more schools should follow the trend of starting later in the morning if they want to see improved test scores, greater attendance numbers, and, most importantly, healthier, happier teens."
<h3>Meaning of a text's conclusion</h3>
The conclusion of a text is the final part of the text where the author summarizes the main ideas of the text.
The text above encourages the opening of schools later to help students enjoy longer hours of sleep. The conclusion beginning with the transition, "hence" aptly summarizes this point.
Learn more about conclusions here:
brainly.com/question/12809344
My Mother's old house, the one that was owned by her family for generations, i s deteriorating. ^^ ^^
D is the best answer choice because it is using an Interrupter meaning that the phrase inside the commas can be taken out and the sentence still makes sense.