According to routine activities theory, Christopher's mother is classifying teenagers as
This is a younger person who is typically between the ages of thirteen and seventeen and in this stage of life, they are usually rebellious and tend to try out new adventurous things.
With this in mind, we can see that Christopher is a 17 year old High school senior who wants to impose a 9pm curfew but he does not agree and she forbids his friends from coming to see him and this shows that she classifies teenagers as motivated offenders.
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