阅读下面短文，掌握其大意，从短文后所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。
Many theories regarding the causes of juvenile delinquency（crimes committed by young people）focus either on the individual or on society as the major contributing influence．Theorieson the individual suggest that childrencriminal behavior before they were not sufficientlyfor previous misbehaviors or that they have learned criminal behavior through interaction with others．Theories focusing on the role of society suggest that children commit crimes into their failure to rise above their socioeconomic status or as a rejection of middle-class values.
Most theories of juvenile delinquency have focused on children fromfamilies，the fact that children from wealthy homes also commit crimes．The latter may commit crimes for lack of adequate control from parents．All，however，are uncertain or unimproved and are of course challenged with criticism.
Changes in the social structure may indirectlyjuvenile crime rates．For example，changes in the economy thatto fewer job opportunities for youth and rising unemployment make gainful employment increasingly difficult to obtain．This results inamong youths and may inlead more youths into criminal behavior.
Families have also experiencedthese years．More families consist of one parent households or two working parents；，children are likely to have less supervision at home than was common in the traditional family．This lack of parental supervision is thought to be an influence on juvenile crime rates．Other noticeableof offensive acts includeexperience or failure in school，theavailability of drugs and alcohol，and the growing phenomenon of child abuse and child neglect．All these conditions tend to increase theof a child committing a criminal act，a direct cause and effect relationship has not yet been established.
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