根据下列内容，回答186-190题。 InspiteofallstoriesofprosperityintheUnitesStates，notonlydoespovertyexistthere，butcnmesotvanoustypeshavebeenincreasingatanalarmingrate．Mostactsofviolencewerecom-mittedbyyoungpeople．57%ofthecriminalsarrestedin1979wereyouthsbelow250fage． Everyoneagreesthatcrimeispartlyaresuhofbadmaterialconditions：poveftv。lackofedu-cation，livingwithinasettledhome，beingparentless，sufferingsfromotherkindsofmisfortune．etc． Therearealsootherfactorsthanmaterialconditionswhichareresponsibleforthesharpin．creaseofcrimerateinthefirstplace，somestatelawsprovideadeathpenaltvbutsomenot．Sec．ondly，theConstitutionallowseverycitizentocarryweaponsforhisownprotection．Itisthereforepossibleandeasyforanyoneinthecountrytogetagun．Finally，therehasbeentoomuchshownonTVandtoomuchreportedinnewspaperofallkindsofcrime，thedetailsofwhicharesoaccu．ratelydescribedthatevenchildrenknowhowtoduplicatewhattheyhaveseenorread．Allthese haveresultedinahighfrequencyofcrimescommittedbothbyprofessionalcriminalsandbynon．professionalonesinmurder，drugsmuggling，robbery，etc． Theauthorintendstotellthereadersthat．
A.the United States is a wealthy country although poverty and crime exist there B.crime has become a serious problem in the United States，although it is said to be a pros-perous one C.despite the fact that crimes have been increasing rapidly in the United States，it is a coun-try of prosperity D.in spite of stories about poverty and crime in the United States，it is prospering at an in-creasing rate正确答案B
