单项选择题

Advertising has become a very specialized activity in modem times. In the business world of today, supply is usually greater than demand. There is great competition between different manufacturers of the same kind of product to persuade customers to buy their own particular brand. They always have to remind the consumer of the name and the qualities of their product. They do this by advertising. The manufacturer advertises in the newspapers and on posters. He sometimes pays for songs about his product in commercial radio programs. He employs attractive salesgirls to distribute samples of it. He organizes competitions, with prizes for the winners. He often advertises on the screens of local cinemas. Most important of all, in countries that have television he has advertisements put into programs that will accept them. Manufacturers often spend large sums of money on advertisements. We buy a particular product because we think that it is the best. We usually think so because of the advertisements that say so. Some people never pause to ask themselves if the advertisements are telling the truth.

The passage tells us that the customer usually buys a particular brand because he thinks that（）.

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