The correct answer is that all stated information are important, they are all connected to substance abuse and Kelly being a delinquent.
Since Kelly has a family that is criminally inclined, it is possible for him to also adapt to those events, wherein he also acts as a criminal, he commits some crimes, and also takes drugs. Since he also grew up in a low-economic neighborhood, it is really possible for Kelly to turn out as a delinquent and also a criminal.