The correct response is:
New York Times v. Sullivan determined that actual malice must be proven to pursue charges of libel in the case of a public official.
This landmark Supreme Court ruling expanded freedom of speech by establishing that public officials must demonstrate "actual malice" (i.e., knowledge that the information was false or reckless disregard for the truth) in order to win a libel case. This ruling protects the press and enables more robust public discourse, particularly regarding criticism of public figures.