What change contributed to a substantial increase in the number of radio talk shows about politics?
a. The growth of cable television, which led to a decline in the number of people who wanted to listen to music on the radio.
b. The conservative media owner Rupert Murdoch's purchase of hundreds of radio stations in the United States.
c. The elimination of the Fairness Doctrine, which freed broadcasters from airing liberal talk shows and conservative talk shows in equal amount.
d. The astonishing success of Al Franken's radio talk show, which led radio station owners to conclude they could make money by airing such shows.
e. Increased partisanship among America's voters.
Answer: c