No, because the risk is to high and they should keep it private.
<span>C. its purpose is the answer.</span>
Teens often feel the need to be accepted by those there own age. When being around there parents they might already feel accepted due to the fact that they are family.
I would say most of the time its A.
In different cases some use it as a avoidance to the problem, situation, or different things in that case.