Which of the Following Actions Has Been Taken to Reform

Which of the following actions has been taken to reform negative campaign advertising?

A) Many newspapers and websites report regularly on the content, presentation, and relative accuracy of campaign advertising.
B) Some candidates have begun taking major newspapers to court because of the campaign information they print.
C) Political parties have created fair campaign practices panels to pass judgment on campaign ads.
D) The Democratic Party has brought court action against Republican candidates in four states for defamation of character of their candidates.