He argued that most important aspect of adolescence is maturity.
Adolescence is the bridge that connects childhood into adults that are capable in handling their own problems.
He describes maturity as a state of developing awareness separate which need to be done and which need to be ignored to achieve our goal.
I am currently a full-time college student and I get 5-6 hours each night night. In high school, I got about 7-8 hours of sleep each night.
Genetic predisposition is a characteristic that makes certain people more susceptible to a particular disorder or condition.
However, the impact of this characteristic can be managed through lifestyle choices. If a person with a genetic predisposition to alcoholism is raised in Saudi Arabia (in a culture where he has no access to alcohol) he would have no trigger, and this disorder would not become present.
D. All of the above, I hope this helped, if you have any questions let me know! :)