What's the population of the United States according to the passage

A．it's mere(只不过的)fuss(小题大做)to write so much about the ideas, feelings, and actions of youth
B．the author blames the young for being trouble-maker at home
C．the author blames the parents for not understanding what their children think and feel
D．the trouble in American families is often caused by difference ideas and opinions between parents and children

A．Einstein did not love his school
B．Einstein couldn't do as his teachers told him to
C．the school was not fit for him
D．there was no room for him in the school