The author's attitude towards American television is ______.

A．be critical but entertaining
B．be creative and educational
C．change with the development of society
D．attract as many viewers as possible

A．advertisers are interested in experimenting with new ideas
B．it is still at an early stage of development, compared with the radio
C．the programs have to be developed in the interests of the sponsors for economic reasons
D．it is controlled by radio companies