阅读材料 回答题。Television has changed the lifestyle. of

阅读材料，回答题。
Television has changed the lifestyle. of people in everyindustrialized country in the world. In the United States, where sociologistshave studied the effects, some interesting observations have been made.
Television, although not essential, has become an importantpart of most people’s lives. It alters people&39;s ways of seeing the World; inmany ways, it supports and sustains(维持) modem life. Televisionhas become a baby-sitter, an introducer of conversations, the major transmitterof culture and a keeper of tradition. Yet when what can be seen on TV in oneday is critically .analyzed, it becomes evident that television is not ateacher but a sustainer; the poor quality of programming does not elevate( 提高)people into greater, understanding, but rather maintains and encouragesthe life as it exists.
The primary reason for the lack of quality in Americantelevision is related to both the history of TV programming development and theeconomics of TV. Television in America began with the radio. Radio companiesand their sponsors first experimented with television. Therefore, the close relationshipwhich the advertisers had with radio programs became the system for American.TV. Sponsors not only paid money for time within programs, but many actuallyproduced the programs. Thus, in American society, television is primarilyconcerned" with reflecting and attracting society rather thanexperimenting with new ideas. Advertisers want to attract the largest viewingaudience possible&39;. To do so requires that the programs be entertaining ratherthan educational, attractive rather than challenging.
Television in America today remains, to a large extent, with thesame organization and standards as it had thirty years ago. The hope forfurther development and true achievement-toward improving society will requirea change in the entire system.
According to theauthor， American television is poor in quality because________ 查看材料
A.advertisers are interested in experimenting with new ideas
B.it is still at an early stage of development， compared withthe radio
C.the programs have to be developed in the interests of thesponsors for economic reasons
D.it is controlled by radio companies
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