Which of the following sets of topics would best organize the information in the selection

A．Ⅰ. Television commercials around the world Ⅱ. Cough drop commercials as an example of television commercials in the United States

B．Ⅰ. Recent tends in television commercials Ⅱ. Steps in making a television commercial

C．Ⅰ. The role of networks and manufacturers in the production of television commercials Ⅱ. Professional personnel required for developing television commercials

D．Ⅰ. Characteristics of television commercials Ⅱ. Goals of television commercials