A Developmentalist Might Teach Adolescents to Self-Monitor for Problematic Internet

A developmentalist might teach adolescents to self-monitor for problematic Internet use by teaching them to look out for signs such as:

A) lying about how much time he or she is spending on the Internet.
B) socially isolating themselves to spend more time online.
C) receiving lower grades than he or she is able to earn.
D) all of these