The U.S. justice system change its treatment of young people beginning in the early 1900s through option C: it began to focus on rehabilitation instead of punishment.
In 1990, the founders of the Juvenile court made reforms for the rehabilitation of young criminals as they saw the young criminals activities a result of negative social interactions.
The founders of the court realized that the young people were being harmed by social factors leading them to crimes. The purpose of this rehabilitation mission was to treat the criminals right so that they avoid a life of crimes in the future.
Many Reformers believed that juveniles needed rehabilitation and assistance and not harsh punishment as innocent youths.
Therefore, correct option is C.
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