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.being parentless
C.lack of education
D.easy access to guns
正确答案是D