Youngsters' artistic development in adolescence is largely the result of:

The answer to this question is Continuing instruction and practice
According to studies, human need to spend abount 10,000 hours in a certain task to be a world expert in doing that specific task.
With continous instrction and practice, our brain could form some sort of special memory that make us able to do the same task with more ease compard to the first time we try it.

B. it promoted the powers of the executive branch