Part a: which statement identifies the central idea of the text?

a
the time that teenagers spend with digital media negatively impacts their ability to make sense of longer and more complex written material.
b
teenagers are not developing the social skills they need to succeed in the world, as digital devices encourage them to spend time alone.
c
fast-paced games and constantly updating social media makes it difficult for teenagers to be entertained by paper media, such as books and magazines.
d
the time that teenagers spend playing video games or on social media takes away from their commitment to their studies, negatively affecting their grades.