Maddie is writing a rebuttal to the counterclaim that protecting people by refusing certain groups membership on social media sites violates Americans' First Amendment right to free speech. Read her rebuttal. (1) Social media is widely used by people of all ages, including children and adolescents. (2) Children and adolescents are still shaping their understanding of the world, making them vulnerable. (3) Social media provides a platform on which extremist groups can exploit that vulnerability. (4) It is unconscionable to expose young people to potential harm for purely philosophical reasons. Which sentence should Maddie revise to strengthen her rebuttal