Answer:
C <em>' Of course, teens are still reading. etc' </em>
Explanation:
C best supports the <em>why it matters that teens are reading less </em>because it actually focuses on the reading. The others don´t. Moreover they convey the important and negative tendency of only reading short texts and not reading longform articles anymore.
Personification I believe if I’m wrong sorry
Personification because the sentence is giving nonliving things human features