In an important study of american children by ullman and straus (2003), it was discovered that approximately percent of adolescents participated in child-to-parent violence during the previous 12 months.

10%

Explanation: In the study ,about the American children released in year 2003 describes about the child-to-parent assault records in one year (12 months).This study was done by Ullman and Straus. According to this study there were 10% cases that describes that the children are assaulting their parents in the form of verbal abuse, beating and other violence forms. This was a major violence issue at that time.This study revealed a major issue in the American society.

c

Explanation: