【单选题】InspiteofallstoriesofprosperityintheUnitedStates,notonlydoespovertyexistthere,butcrimesofvarioustypeshavebeenincreasingatanalarmingrate.Mostactsofviolencewerecommittedbyyoungpeople.57%ofthecriminalsarrestedin1979wereyouthsbelow25ofage.Everyoneagreesthatcrimeispartlyaresultofbadmaterialconditions:poverty,lackofeducation,livingwithoutasettledhome,beingparentless,sufferingsfromotherkindsofmisfortune,etc.Therearealsootherfactorsthanmaterialconditionswhichareresponsibleforthesharpincreaseofcrimerate.Inthefirstplace,somestatelawsprovideadeathpenaltybutsomenot.Secondly,theConstitutionallowseverycitizentocarryweaponsforhisownprotection.Itisthereforepossibleandeasyforanyoneinthecountrytogetagun.Finally,therehasbeentoomuchshownonTVandtoomuchreportedinnewspaperofallkindsofcrime,thedetailsofwhicharesoaccuratelydescribedthatevenchildrenknowhowtoduplicatewhattheyhaveseenorread.Allthesehaveresultedinahighfrequencyofcrimescommittedbothbyprofessionalcriminalsandbynonprofessionalonesinmurder,drugsmuggling,robbery,etc.?Besidesbadmaterialconditions,__________alsoleadstothesharpincreaseofcrimerate.A、poverty
B、beingparentless
C、lackofeducation
D、easyaccesstoguns