A、The local governments． B、Their owners’families. C、Advertisements． D、The audience． C细节题。文中提示电视台、报纸、杂志、电台等传媒是私有的，然后用一问一答给出此题的正解，

When you turn on the radio，you hear an advertisement. When you watch television，you hear and see an advertisement. If you turn the pages of a newspaper or magazine，again you find an advertisement. If you walk down the street，you see one advertising board after another. All day，every day，people who want to sell you something competent to catch your attention. As a result，advertisements are almost everywhere. In the West，advertisements are the fuel that makes mass media work. The government does not give money to mass media such as TV stations，newspapers，magazines and radio stations. They are all owned privately. So where does the money come from?From advertisements. Without advertisements，there would not be these private businesses.
    Have you ever asked yourself what advertising is?Through the years，people have given different answers to the question. For some time it was felt that advertising was a means of“keeping your name before the public”. And some people thought that advertising was“truth well told”. Now more and more people describe it in this way: Advertising is the paid，nonpersonal，and usually persuasive description of goods，services and ideas through various media.
    All advertisements try to make people believe that the product，idea，or service advertised can do well to them. Advertisements exist everywhere in our lives.