题目内容：
回答题：Urban life has always involved a balancing Of opplIrtunities and rewards againstdangers andstress；its motivating force is，in the broadest sense，money：The presence of huge numbers ofpeople inevitably involves moreconflict，more traveling,the overloading of publicservices and ek-posure to those deviants and criminals who are drawn to therich pickings of great cities．
As adefense against these developments．city dwellers tend to use variousstrategies to try andreduce the pressures upon themselves；contacts with other peopleare generally made brief and im-personal；doors are keptlocked and so on．There are ther strategies，t00，which are positivelyharmful to theindividuals，for example，reducingawareness through drugs or alcoh01．Furthe r-more，all these defensive forms of behavior are harmful to society in general．Lack of informal so-cial contact and in difference to the misfortunesof other，are amongsl the major causes of urb incrime．
Presentday architecture and planning have enormou；ly worsened the humanproblems of urb inlife．People have been forced to leavetheir familiar hormes．usually to be rehoused in tower blocks which are inconvenient．This destruction ofestablished social structures is the worst possible ap-proach to thedifficulties of living in a town or city．Ins ead，every efibrt shoUld be made to con-serve the human scale of theenvironment，and to retain familiar landmarks．
According to the author，living in a city cause r stress because there are so many people whoare__________． A．in need of help
B．naturally aggressive
C．likely to commit crime
D．anxious to succeed
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