The author lists several negative effects playing video games may have on teenagers. Choices A, B, and C only describe individual arguments when many are provided, and do not summarize the author's point of view.
Being less active, having fewer friends, and doing worse in school are all negative effects, so D seems logical.
Anytime you use more than one exclamation point or question mark it is known to be very improper do to you already knowing that it's a question or a loud remark
