According to some commentators, teenagers have become separate from adult society to such an extent that they have established their own society, which undermines parents' authority and emphasizes peer deviance. This society is called:

answer; traffic,pedestrians,parked vehicles and intersections;

communication.

explanation:

don't be afraid to ask. if you really want to know why they suddenly don't talk to you, ask. but be polite while asking. tell them how you feel. if you feel upset about them ghosting you, say so. people cannot read your mind, so you need to let them know if this bothers you. if they say it's personal family matters, don't get offended. they need space if it's personal.

your answer is b i think