What Is a Scientifically Valid Concern Regarding Adolescents' Media Use

What is a scientifically valid concern regarding adolescents' media use?

A) Adolescents who use the Internet for socializing are at a high risk of being the victim of unwanted sexual attention.
B) Adolescents who frequently use the Internet experience detrimental effects on their mental health.
C) The amount of time adolescents spend watching TV and playing video games is inversely linked to the amount of time they spend in physical activity.
D) The increased time spent on the Internet has had a negative effect on adolescents' social development and relationships.