B. People now look at others and start comparing everything they do, to whatever other people do, maybe. May it be friends, celebrities or anyone else far away on the internet. We somehow are never satisfied with what we have and get (unnecessarily) depressed.
The people who care less about others and/or who have the ability to be satisfied with themselves, I think are less prone to such depression.
I totally agree with your point. People are always looking at others and all they see is what is the one thing the person has and they do not, suddenly they start falling apart as if it is the end of the world. Like, jeez man calm your ish and learn to be happy with what you got.