Studies have shown that teenagers are... A
engaging in social activities with their friends less.
socializing more than ever, but rather online.
reading less because it's a solitary activity.
going to more movies with their friends than ever before.

Adolescents also report being happier on days when they help their families. Studies have shown that students who are helpful, cooperative, and sharing tend to be more popular than those who use fear or intimidation to gain status, providing another incentive to contribute. This is particularly crucial to adolescents, who, thanks to hormonal changes beginning at the onset of puberty, are ...

Explanation:

the answer is: the start of world war i, and russia’s hopes of benefiting from it

during world war i russian joined due to in their current crisis they were being supported by france and the war was already declared to them by germany, they needed to maintain their political goal and leadership role in the balkans, and is the same feeling that this excerpt evoke the eager of maintain the land value.