根据下列内容，回答186-190题。 In spite of all stories of prosperity in the Unites States，not only does poverty exist there，but cnmes ot vanous types have been increasing at an alarming rate．Most acts of violence were com-mitted by young people．57%of the criminals arrested in 1979 were youths below 250f age． Everyone agrees that crime is partly a resuh of bad material conditions：poveftv。lack of edu-cation，living within a settled home，being parentless，sufferings from other kinds of misfortune．etc． There are also other factors than material conditions which are responsible for the sharp in．crease of crime rate in the first place，some state laws provide a death penaltv but some not．Sec．ondly，the Constitution allows every citizen to carry weapons for his own protection．It is therefore possible and easy for anyone in the country to get a gun．Finally，there has been too much shown on TV and too much reported in newspaper of all kinds of crime，the details of which are so accu．rately described that even children know how to duplicate what they have seen or read．All these have resulted in a high frequency of crimes committed both by professional criminals and by non．professional ones in murder，drug smuggling，robbery，etc． The author intends to tell the readers that．
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