the answer is C) brain, with potentially serious psychological and emotional costs
Explanation:
This is the correct answer according to collegeboard on AP classroom 2021.
AP classroom explanation : This choice best previews the passages line of reasoning. The second paragraph explains how frequent phone notifications caused the brain to release dopamine, and the third paragraph explains how this change in the release of dopamine cause a psychological and psychological effects, such an elevated pulse, shortness of breath, and higher levels of anxiety
A pause can be used to give emphasis to a certain point. The pauses can also be used to single out a certain sentence and those sentences are what later get quoted in newspaper articles or people what people use to refer to the speech in question.
